Far and Near Vision: Switching to Progressive Lenses

Far and Near Vision: Switching to Progressive Lenses

Doig Optometry is calling all bifocal users in Calgary to come to us to experience the switch to progressive lenses. Progressive lenses can now remedy magnification issues that may have kept you from switching out of your bifocal lenses. Plus, progressive lenses just look better!

Progressive Lenses — These are a fantastic alternative to bifocal lenses as they have no visible line between lens windows. Traditional bifocal lenses can be a nuisance when they cause a jump between near and far sight, and they aren’t preferred aesthetically. Improving both your vision and your image, progressive lenses cater to patients with near and far vision issues.

Magnification Effects — For the average glasses wearer, magnification effects aren’t a point of concern. They’ll only look through one prescription window at any given moment, so the “magnification jump” that bifocal wearers experience isn’t an issue. However, patients with near and far vision issues require multiple windows with multiple prescriptions. We consider the jump between the different prescriptions when crafting progressive lenses, because that’s how we minimize the magnification effects and make your progressive lenses easier to get used to.

Of course, each pair must be specially crafted for the patient. At Doig Optometry, we consider many factors besides magnification effects, including working distance, down gaze angle, near point inset, inter-pupillary distance, and at least four other important factors when we design your progressive lenses.

Is that too much technical jargon? Don’t worry, all you need to do is book your first appointment with Doig Optometry today, and we’ll take care of the rest. Call 403-333-3353.

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Why Your Choice of Frame is Important for Progressive Lenses

We could list many reasons why you should always visit an optometrist for comprehensive eye care. Just one of those reasons relates to how your final choice of frames will affect your vision as well. What good are all of the fine-tuned measurements if, at the end of the process, your frames are too far or too close to your eyes? In this blog we explore vertex distance and why it’s important.

What is Vertex Distance? It might seem like an impossibly small measurement, but vertex distance is just one measurement we consider when crafting your progressive lens. It refers to the distance between your eye and the back of the lens. Lens power and magnification effects change when your lenses are further from your eyes, similar to how a magnifying glass enlarges an object the further away it is held.

Why We Measure: Every patient’s face is different and the vertex distance will change from person-to-person, even with the same pair of glasses. This is especially true for progressive lenses, which cater to complex vision requirements. The height of the window used for reading must also allow space for distance viewing and vice versa. If your frames are prone to slipping down the bridge of your nose, or sit at an awkward angle, your progressive lenses will not work as well.

When Do We Measure Vertex Distance? Vertex Distance is one of the only things we measure once every other part of the process is complete. After you have chosen your frames, we look at how much space we have for each prescription to fit in the frame. We then consider how far those frames will sit away from your eyes by measuring the Vertex Distance. Once the distance is determined, all the other aspects such as working distance, down gaze angle, near point inset and inter-pupillary distance fall into place.

So now you can see why a mere prescription on a piece of paper does not make a good pair of glasses. By guiding you through the stages of this process, we are sure that we’ll provide you with a pair of progressive lenses that feel as natural as possible. If you’re a bifocal wearer, or have complex vision requirements that you haven’t yet addressed, it’s time to make the easy switch to progressive lenses – just call Doig Optometry at 403-333-3353 or visit our Calgary location (102, 8180 MacLeod Trail South, T2H 2B8)

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Pantoscopic Tilt and Panoramic Angle

Every pair of glasses are different. That’s what we love about them! Your frame’s unique look expresses your personality, and your glasses should be your favourite thing to wear. Here are some factors that will create the distinction between quality frames and bothersome glasses that’ll only bring headaches.

Pantoscopic Tilt is a measurement we take which analyses the angle from the bottom of your glasses (at the cheek) to the top of the frame. Some glasses have flat frames, but most will tilt slightly, so the top portion of your glasses is slightly further from your face than the bottom. In fact, for progressive lenses, a slight tilt can assist your vision by contributing to the right kind of magnification effect.

What are Wrapped Frames and Why Do People Get Them? Wrapped frames will have a different panoramic angle than flat frames. Panoramic angle is the extent to which your glasses curve from the centre (nearest your nose) to the edge. It is more common to see a drastic panoramic angle on sunglasses than it is for reading or distance glasses. The reason so many sunglasses have a panoramic shape is because the curved edges don’t block peripheral vision and are therefore better for physical activities.

Consider How Your Lifestyle May Affect Your Visual Demands, and bring that information to your next appointment. At Doig Optometry, we have this conversation with every patient that walks through our doors. That’s what makes our services different. We want to find the best lenses for your lifestyle, and sometimes that means taking additional measurements to create a pair of glasses that allow you to be as active as someone with perfect vision. Even our progressive lenses can be created with any kind of pantoscopic tilt or panoramic angle in mind.

The type of glasses you wear shouldn’t affect your lifestyle. Let your lifestyle inform the type of glasses you wear. Have you scheduled your appointment with Dr. Doig yet? Our Calgary optometry clinic is conveniently located, and he’ll find you a pair of glasses that ensures you see sharp and look sharp — whatever you’re doing. Call us at 403-333-3353 to schedule your appointment now

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Segment Height and Binocular Balance

Are you about to make the switch to progressive lenses? Congratulations! Progressive lenses are a fantastic alternative to bifocals, and they assist multiple fields of vision by offering a seamless transition between each field. To ensure that your progressive lenses are perfect, there are few additional measurements the friendly Calgary optometrists at Doig Optometry will have to carry out.

By Nature we are biologically attuned to viewing close-up objects through the lower portion of our vision and distant objects through the top. When you hold an object,  whether it’s a book, your phone, or some ancient tool our homosapien ancestors may have looked at, we all view near objects through the lower part of our vision. In order to measure segment height for reading or work on a computer, your optometrist will look at the distance from the bottom of the frame to approximately the middle of your pupil.

Binocular Balance: Ever wonder how even your eyes are? Some people will have a more apparent difference between the symmetry of their eyes. Others may have a slight difference that can go unnoticed unless a test is carried out. Testing your binocular balance will determine the evenness of your eyes, allowing Dr. Doig or Dr. Chorel to make precise adjustments which can compensate for asymmetrical vision.

The Ten Comprehensive Tests carried out by Doig Optometry cannot be replaced by an online test or self-exam, especially when it comes to progressive lenses. Omit, skip, or make even a slight mistake on these tests, and instead of glasses you love, you’ll be stuck with a pair you hate, or worse, headaches and blurred vision.

Come into Doig Optometry for a comprehensive exam that gives you a better knowledge of your own vision than you’ve ever had before. Our Calgary optometry clinic is conveniently located at 102, 8180 MacLeod Trail South East. Schedule your appointment today!

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Vertex Distance

After you’ve chosen your fancy new frames, there’s still an important final measurement that has to take place. That’s vertex distance, and it refers to the distance between your eyes and your progressive lenses.

Progressive Lenses, in case you’re unfamiliar with these glasses, are a modern alternative to bifocal lenses that assist two fields of vision and transition seamlessly between the two. The lens transition is invisible for both the wearer and those the wearer interacts with, as (unlike bifocals) progressive lenses have no visible lines between fields of vision. Various measurements take place to ensure that the fields of vision sit in the appropriate part of the lens vertically, but vertex distance is a factor that can only be measured once frames have been chosen.

Magnification Effects vary with the distance between your lenses and your eyes. This can affect the quality of your vision, even if the near and far fields of vision sit in the right place vertically within a pair of glasses. You should ensure that the glasses you wear aren’t prone to falling down your nose. If this affects you, we want you to know that you shouldn’t have to constantly adjust your glasses. So whether you’re ready for a new pair or are just tired of pushing your glasses back up your nose, visit Doig Optometry. Our friendly, Calgary optometrists will help you choose your next pair of glasses, and we’re also happy to adjust your current ones so they fit properly.

Switching from Contact Lenses to Glasses: Vertex Distance is also very important to measure for patients who wear contact lenses and glasses. This is especially true if their prescription is -/+4.00D or more. Higher prescriptions will see a stronger magnification effect and the contact lens power will be completely different from the glasses prescription. If you wear contact lenses, stop by Doig Optometry to ensure a proper match between your contacts and your glasses prescription.  

Why Wait? We have many patients who wonder why they can’t just duplicate the vertex distance measured using the glasses they’re wearing right now. Simply put, it’s because every frame fits differently. Even the very same pair of glasses will fit two people very differently. To get an accurate measurement, we’ll have to see how your new frames fit on you. While ordering glasses online, in your pyjamas is certainly convenient, it’s impossible to ensure the proper fit and vertex distance measurement unless we see your new frames “as worn” on your face.

So even if you haven’t already booked your appointment with Doig Optometry, hopefully we’ve instilled into you the importance of professional eye consultations. If you’re ready to book your first visit with us, simply call our Calgary optometry clinic at 403-333-3353. We look forward to seeing you!


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Different Visual and Lifestyle Factors for Progressive Lenses

What Can You Do To Prepare For Your First Appointment?

Many of our patients, when preparing for their first appointment to get fitted with progressive lenses, ask us what they should bring with them. This is a great question! We ask our patients to bring their phone (or a book) to their appointment, in order for us to view the angle at which they read. In addition to this, we want to know more about your lifestyle, so we may ask questions about your work, your travel, and your daily habits.

Track How Much Time Are You Staring at a Screen?

It’s great for us to know how much time you spend on a screen. Screens are such a big part of our day-to-day lives in 2017. Many of us will spend an entire work day looking at a screen, and not enough of us have the right protection. By knowing how much time you spend in front of a screen, the Calgary optometrists at Doig Optometry can make personalized recommendations. For example, blue light protection can help office workers prevent eye strain by aiding with some of the screen glare they intake by sitting in front of a phone or desktop computer.

How Active Are You?

If you spend a lot of time driving or outside doing physical work like landscaping or construction, it may not be a blue light filter that you need. In this case, Dr. Doig or Dr. Chorel will recommend transition glasses, prescription sunglasses, or at least a pair of clear glasses with UV protection coating. If you have a particularly active lifestyle, you can also ask your Doig optometrist about panoramic angle. Panoramic angle is the measurement of lens curvature. Patients with particularly active lifestyles may benefit from a curved lens as it doesn’t block peripheral vision as much as normal, flat, glasses

Please bring your phone (or a book) and details about your activities, hobbies, and interests to your next eye appointment at Doig Optometry.  Knowing about your visual demands at work and at home will help our optometrists in making recommendations customized to your unique visual needs.

Hopefully this blog got you thinking about progressives, and you’re ready to book your first appointment! If so, call 403-333-3353 to book an appointment at our Calgary optometry clinic.


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High Energy Light Protection (H.E.L.P)

If you’ve recently been in the market for glasses, you may have noticed that things seem to have gotten a bit more complicated over the years. Many glasses are being labeled with initialisms like UV and HEV. But what do all these letters mean? UV? HEV? What are these labels on store-bought sunglasses or in your glasses manufacturer’s advertising actually referring to? How do they affect the practical everyday world? How are you protected? From what? By how much? We’re here to help answer these questions.

Explaining the Light Spectrum and “High Energy”

The light spectrum (as we understand it so far) goes from invisible infrared light to invisible ultraviolet (UV) light, in the middle between those two extremes is the visible spectrum which includes all the colours that people can see.

Therefore, what it means when glasses have “UV protection” is that theses glasses contain some type of material that either absorbs or reflects this highest energy part of the light spectrum (the ultraviolet range). This is really important because our sun emits light along the entire spectrum — not just visible light. And UV light, while necessary for vitamin D generation, can cause sun burns and skin cancer in excessive amounts. And yes, eyes can get sunburnt. Lenses with UV protection help to prevent this. When UV light hits your glasses, it’s reflected or absorbed into the UV protected glass.

What’s more rare is finding a pair of glasses that protects against the high energy light of the visible spectrum. This light has almost as much energy as UV, but it’s still visible to people. You may have heard of this high energy light referred to as “blue light,” and it’s emitted by the sun but also in the glow of computer screens and smartphones. During the day, some blue light isn’t a bad thing. It signals your brain that it’s day and that you should be awake and alert. But too much blue light can cause digital eye strain, and at night, it can prevent your brain from receiving the signals that it’s time to go to sleep.

What too much blue can mean for your sight long term…

Any type of light, whether visible or not, will affect our eyes, but which area of our eyes is affected depends on which frequencies of light we’re exposed to. Higher energy light (like blue light) affects the back of the eye which increases the risk of macular degeneration. Excessive exposure to UV light and blue light also increases your risk of cataracts at the front of the eye.

How can blue light be stopped?

In the same way that a coating on sunglasses captures the sun’s UV light, a different type of coating can be added to glasses to catch the blue light emitted from tablets, smartphones, and computer screens. A little blue light is fine, but reducing your exposure to this high energy light will help prevent macular degeneration.

At Doig Optometry, we’ve coined the phrase “High Energy Light Protection” or H.E.L.P. to describe all the things we do to protect your eyes from the damage that can come from high energy blue light. Getting High Energy Light Protection (H.E.L.P.) sets your glasses light years ahead from those who still do daily work on a computer screen without any protection. Glasses with H.E.L.P. will protect your eyes from macular degeneration, digital eyestrain, and make it easier to sleep at night.

Do your eyes need some H.E.L.P.? If you spend most of your time staring at a screen rather than the beach, you may want to swap out the sunnies for some hip H.E.L.P. shades. Get started by booking an appointment with Calgary’s Doig Optometry. Call us at (403) 333-3353 today!


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What’s the Difference Between Ordering Glasses Online and Buying them from Your Trusted Calgary Optometrist?

Advertisements for online eyewear seem to be everywhere nowadays. These advertisements usually boast their cheaper deals, the convenience of ordering online rather than navigating the snowy Calgary streets, and the claim that if you don’t like your glasses, you can just mail them back — no questions asked. But are you actually getting the same great quality you’d find at Doig Optometry?

Research has shown that as much as half of all eyewear ordered online failed at least one of the criteria for optical quality or impact resistance testing. (Journal of the American Optometric Association, Vol 82, No 9, September 2011) When buying online, you take on all the responsibility of a professional, Calgary optometrist onto yourself. It’s suddenly up to you to take technical measurements and make all the important decisions about the fit of the frame, the lens material, and the treatments and coatings. If you fail to make the right choice, then you’re left with unsatisfactory glasses that don’t fit well, cause headaches, and leave your vision blurry. And whether it’s a problem with the frame’s fit or quality, the sharpness of vision, chronic headaches, eye pain, or a feeling of pressure, pulling, or strain in the eyes, the consumer takes the responsibility. Internet providers of eyewear are unregulated, and they are not required to comply with legislation that ensures the safety and accuracy of the finished eyewear.  Instead, you’re left with the option of dealing with glasses that don’t work well or sending them back to try again and again, until you become frustrated and give up.

Quality eyewear is the result of custom work. Just like your fingerprint is unique, your eyes and your face are like no one else’s, and only expertise can bring the personalized touch that makes your glasses flawlessly yours. That’s why the Doctors and staff at Calgary’s Doig Optometry spend all the time necessary to make careful custom measurements and ensure that your eyeglasses work perfectly for you at work, on the go, and everywhere in between.

Most online glasses aren’t terrible, but it’s simply impossible for them to compare to a pair that’s uniquely crafted for you. The expert eye doctors at Doig Optometry take the time to learn about your lifestyle vision demands, and they make the precise measurements that relate to your individual needs. And yes, we really do need to see your eyes in our office to make those precise, custom measurements. Once we’ve obtained all the custom measurement needed, we partner with a lab capable of creating individualized glasses tailored especially for you. Once they complete all of their work, we verify that your eyeglasses meet the highest standards for quality that Dr. Doig has set.

Patients sometimes ask if we can measure their PD for them. Inter-Pupillary Distance, or PD, is one of the measurements needed to order glasses online. Of course, we can measure your PD and give it to you, but what about all the other custom measurements? Glasses aren’t just a fashion accessory. You may be wearing this pair of glasses every single day for a year, two, or even more, so it’s necessary to get them just right. Here’s the list of all the things Dr. Doig wants to know and understand before we make your glasses:
  • Inter-Pupillary Distance
  • Optical Centre height
  • Near Point Inset
  • Working Distance
  • Down Gaze Angle
  • Vertex Distance
  • Pantoscopic Tilt
  • Panoramic Angle
  • Binocular Balance
  • Lifestyle Visual Demands
When we know all these things, we can make a pair of glasses that are sharp, comfortable, and look great. Absolutely, some of these measurements can be standardized for most patients who have small, simple prescriptions. But for most patients, who wear high prescriptions, or Progressive Lenses, it’s impossible to make a great pair of glasses without understanding all ten things on this list.   

Since modern, optically perfect eyeglasses can only be made with customized measurements, and since online suppliers can’t get accurate customized measurements, they usually provide the simplest optical lenses that can be manufactured with approximate measurements or measurements that can be standardized for large groups of people. This means that internet vendors can only supply older, conventional lenses that have fallen out of favor in a world where the vision standards for lenses are much more advanced.

Consumers should know that the deeply discounted pricing online is for product that is discontinued or out of fashion. If you are interested in purchasing affordable eyewear, come visit Doig Optometry to learn about our package pricing. All of our glasses are carefully crafted by our staff and doctors, and they take in account all the custom measurements necessary for giving you flawless sight. We have affordable single vision and progressive eyeglass packages, and two pair pricing which includes the frame, personal customized lenses, coatings, case, cleaning cloth and spray. We are confident that you’ll be pleasantly surprised at how affordable these warranteed packages are. Call us today with any questions.

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Visual Comfort in Progressive Lenses

Our eyes like to be comfortably relaxed. Just as you can strain a leg muscle from running too far or too fast, eyes that are constantly working become stressed and strained. Unfortunately for Calgarians who wear glasses, there’s no simple way to take just take it easy on your eyes if your glasses’ prescription or fit is what’s causing your eye strain. That’s why it’s so important to work with an expert Calgary optometrist instead of just ordering glasses from the internet. For more complicated glasses, like bifocals or progressives, this is doubly true.

When you put on a pair of progressive eyeglasses made at Doig Optometry, you can rest assured that our friendly eye doctors and staff have done everything possible to ensure that your vision is perfect  and that your eyes are relaxed and comfortable when you wear your new glasses. Since progressive lenses have one prescription in the upper portion of the eyeglasses and a different prescription in the lower portion of the eyeglasses, Dr. Doig or Dr. Chorel will have to customize your progressive lenses so that your eyes are comfortable. Whether you’re looking at the Rockies off in the distance or browsing the internet on your phone, we create glasses you can depend on.  

It’s all about Managing Magnification

Specifically, it’s about the differences in magnification between the top and the bottom of your progressive lenses. If your eyes can smoothly move from top to bottom or from left to right  without experiencing a jarring change in magnification, then your eyes will feel completely comfortable in your progressive lenses. Not including your prescription, there are ten different factors that can cause uncomfortable differences in magnification between the top and the bottom of your progressive lenses. Understanding these factors and knowing what to do about them is how the eye doctors and staff at Doig Optometry make your progressive lenses sharp, clear, and comfortable to wear.  

How to Achieve Comfort in your next Progressive Eyeglasses

Many Calgarians have progressive glasses that aren’t perfectly fitted for them. This can lead to them believing that sore eyes and headaches are just a part of living with progressives eyeglasses. But that is not the case. Everyone deserves to see clearly without unwanted side effects, and our Calgary optometrists can help. If your eyes feel sore, achy, or tired, or if you experience headaches when you wear your progressive lenses, please call Doig Optometry to schedule a complete eye exam. Dr. Doig or and Dr. Chorel will do specific tests to determine what eyeglass prescription will make your eyes the most comfortable. They’ll explain which  progressive lens brand works best with your unique prescription, and they’ll work with the staff at Doig Optometry to help you find a fashion forward frame that will make your progressive eyeglasses work as comfortably as possible. Finally, they’ll measure the ten things that need to be considered in order for your prescription, your frame, and your progressive lenses to work together, so when you take your new glasses home you can see sharp, look sharp, and feel comfortable.

What if you can’t replace your Progressive Eyeglasses just now?

At Doig Optometry, we understand that many Calgarians simply can’t afford to replace their uncomfortable glasses. We want you to know that we really believe that everyone has a right to sight, and that we still want to try and make your situation a little better with a comfort specific frame adjustment. Often, there are adjustments we can make to the way your frame fits that will minimize the magnification differences that cause almost all of the visual discomfort in progressive lenses. While you’re here, we can tell you about our progressive frame and lens packages, which include frames, lenses, coatings, cleaning cloth, spray cleaner, and a protective case, all made with the same care and attention Dr. Doig and Dr. Chorel give to every new pair of progressive lenses. You may be pleasantly surprised at how affordable a new pair of progressive eyeglasses can be.

At Doig Optometry, it is our privilege to help Calgarians to see their world clearly and comfortably. Putting on and using your progressive eyeglasses each morning should be as natural as opening your eyes. Let us help.


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