Facts From Dr. Josh Josephson

From finding the right frames to the importance of sunglasses, find out all the info  you need from our videos below.




Tips for Good Vision from Dr. Josh Josephson, President, Josephson Opticians

Topics of discussion:

  • Precautions when buying glasses online.
  • What is visual fatigue and what causes this problem.
  • The importance of sunglasses on BOTH cloudy and SUNNY days.
  • The unique risks of UV radiation for your children.
  • What are computer glasses and why are they so special?

Precautions when Buying Glasses Online:

Shopping for glasses online may seem simple, but there are several important considerations that should be taken into account before making a purchase. When selecting a new pair of frames and lenses, the following assessments are recommended best practices, and can only be achieved with proper in-person assistance and consultation from a qualified optician:

  • 3) An assessment of the frame fit to consider the potential for best visual and physical comfort
  • 4) Assessment of and discussion of potential for eye-fatigue with a given frame / lens combinations
  • 1) Comprehensive measurement and analysis of each individual eye, the separation between the centers’ of the 2 eyes, the relationship between the shape of the face and the shape of the frame, and the measure of the distance between the pupillary centre and the bottom of the frame.
  • 2) Proper measurement of facial structures

BUYING FRAMES ONLINE MAY SEEM EASY; however, the physical measurement and measuring process for achieving optimal vision, is complex, requiring an in-person visit with an optician who will provide precise knowledge and expertise. In addition to the considerations mentioned above, visiting an optician or optometrist will ensure proper customization of lenses for an individual, maximizing the optical field of view for each individual eye and minimizing distortion – important steps in reducing induced optical aberrations.

Ordering lenses online DOES NOT ALLOW the shopper to have customized optical measurements, including: Inter pupillary distance; Face form; Frame tilt; among others.

Overviews of these in person, best practices are included below for your reference:

Interpupillary distance: the measurement from the centre of the bridge to the midpoint of the pupils of each eye.

  • This measurement is often asymmetrical and unique for each individual eye—a consideration not taken into account when ordering frames/glasses online where this measurement incorrectly assumes symmetry..
  • If the asymmetrical difference is not measured correctly and properly, long-term visual and physical discomfort can occur.
  • Ignoring the proper measurement method may cause premature visual fatigue.

Face Form: The relative shape of the face compared to the curve of the frame.

  • This measurement is used in combination with new optical technology to reduce optical aberrations that could adversely affect the optimal visual performance of the final prescription, and your personal visual comfort.
  • The face form measurement increases the accuracy in lens design and therefore improves overall quality of vision

Frame Tilt: Only certified eye care professionals are able to appropriately measure the frame angle relative to the face. This process ensures the optical accuracy of the prescription placed in the frame and minimizes induced optical aberrations and optical distortion.

The above individually measured interpupillary distance, face form and frame tilt measurements are disregarded when online shopping. Further, in measuring interpupillary distance, it is a challenge for individuals to properly take this measurement themselves. 

Be sure to see an optician for a comprehensive and exact assessment of your unique optical needs and requirements – the optician will ensure a comfortable fit on the face, and improved overall vision.

Online Ordering: Retail Outlet à Manufacturer àConsumer

Ordering online may ensure fast delivery of product, but will not protect the consumer against delivery of lenses/glasses that perform imperfectly. A doctor’s prescription, when used for online glasses, is not enough to ensure that the RX is made as intended by the Dr,, that the fit is appropriate and certainly does not ensure good comfort .

Ordering from the Optician: Optician àManufacturer à Optician à Consumer

When lenses are ordered from and are produced by a lens manufacturer, they are delivered to the optometrist or optician and then, are typically quality controlled in-house. When delivered to an optician, the lenses are often cut, edged, mounted to the frames, and rechecked again. If this process is done at the lab of a small or large chain the finished glasses are then delivered to the retail outlet where they are re-inspected there by a store optician and packaged for pick up by the client.

A qualified and license professional will guarantee a proper fit to any face. They will also ensure that the prescribed lenses are properly made and adjusted correctly to the face so they will function as the doctor intended.

What is visual fatigue? What causes visual fatigue?

  • Usually due to ocular stress with activities and caused by:
    • Expired or incorrect prescriptions or frames those are either incorrectly fitting or incorrectly adjusted.
    • Reading/viewing too closely at a computer screen, smart phone, the television, videos games*, etc.
  • Tired, itchy, dry or burning eyes can be symptoms of eye fatigue or dry eyes.


Importance of Sunglasses on both Cloudy and Sunny Days:

UV radiation is an issue on both sunny days with no clouds as well as very overcast and cloudy days. In fact, there is more danger from increased UV radiation on cloudy days than sunny days with no clouds!

Excessive exposure to UV radiation may cause early onset of cataracts, as well as macular degeneration. Macular degeneration may lead to permanent and irreversible vision loss. Wearing proper sunglasses will limit susceptibility to these often-detrimental eye problems.

Brown sunglass lenses help to enhance vision on cloudy days; Grey lensed sunglasses are ideal for sunny days with minimal clouds. Polarized lenses reduce reflected glare from road surfaces, water surfaces, etc..

The Risks of Sun and UV Radiation for Your Children: 

  • Children’s eyes are more vulnerable to the adverse and damaging effects of ultra violet light because their younger less developed eyes are less protected from UV radiation than adults. Children’s eyes do not contain chromophore – a chemical in the adult ocular lens that absorbs small amounts of UV radiation – this chemical increases with age.

Parents slather the skin of their children with protective sun lotion; however protecting your children’s eyes is equally important. Sunglasses should be thought of as sunscreen for the eyes when it comes to young children.

There are ocular risks associated with the neglect of sunglasses for children, including:

  • Unlike a suntan or sunburn on the skin that fades over time, the adverse effects of UV radiations on the retina are permanent and cumulative over time.
  • Due to the thinning of the ozone, UV radiation has become more severe than it was 30 years ago.
  • Opticians will ensure that clients get adequate protection by wearing properly fitted, customized eyewear

Proper precautions should be considered. Purchase your child’s sunglasses at a store that is staffed by a licensed optician only. Optical stores must adhere to regulatory, professional and quality standards. All sunglasses purchased in stores staffed by licensed opticians or optometrists satisfy a standard of UV protective level that will protect your eyes and the eyes of children.

Computer Glasses:

  • Specific glasses, worn for when looking at a computer screen that can provide greater versatility of vision within a four foot range, and lead to much less eye fatigue. And less neck and shoulder muscle fatigue.
  • Conventional reading glasses are single vision lenses with a fixed focus. The new optical technology of computer glasses has far surpassed them, now providing a much great range and versatility of vision.
  • Computer glasses make you more comfortable by providing you with a greater range of clear vision, as opposed to using reading glasses which have a very limited focal distance, and that sit low on the nose, an unflattering look.
  • They allow you to look down at your work and back up to the computer screen, easily, with good, comfortable head, neck and shoulder posture without any visual distortion or blurry vision.
  • Conventional progressive glasses, good for reading in general are unsuitable for looking at the computer screen because with more advanced prescriptions wearers of these glasses find that it is necessary to raise one’s chin slightly to look at the screen, an uncomfortable position to maintain.
Overall, it is extremely important to meet with an optician when purchasing different types of eyewear, as they can serve various visual needs.
Sincerely, Dr. Josh Josephson