Eyeglass Lens Consultation
Which eyeglass lens type suits you?
Eyeglass Lens Basics
Eyeglass lens technology continues to advance with lighter materials, better optical quality, more accurate correction of refractive error, and better performing near visual correction than ever before. With these advances it can be difficult for patients to decide from the myriad of lens designs, coatings, and brands. At OPTIVIEW Eye Clinic, we can help patients decide which lens choice will best fit their visual needs at an appropriate price point.
Single Vision Lenses
The most simple lens design is known as a single vision lens. Basic single vision lens are pre-manufactured with a single refractive error throughout the lens. They are commonly used to correct distance vision or near vision issues. Its important to note that patients who are presbyopic (patients with reading difficulty who are usually over 39 years old) or younger patients with focussing problems may not be able to see well at all distances with single vision lenses. These patients may benefit from using anti-fatigue, bifocal, or progressive lenses depending on the circumstances.
Bifocal lenses have been around for over a century, they typically have a lined segment towards the inferior nasal side of the lens which has an additional lens power used for clear near vision while the rest of the lens is used for distance vision. While simple to use which easy adaptation, drawbacks include lack of an intermediate zone for computer vision correction and for some patients’ poor cosmetics as the lined segment tends to age us.
Progressive Lenses allow for clear vision at distance, intermediate, and near in presbyopic (over 39) patients and younger patients with focussing difficulties. Conventional progressive lens designs have a vertical “corridor” which is centered around the pupil and as patients look further down through the lens the reading strength continues to increase resulting in clear distance vision through the top, clear intermediate vision through the middle, and clear reading vision through the bottom of the lens. Drawbacks of conventional progressive lenses include poor width of clear vision as the corridor is quite narrow, and in some patients there is difficulty with adaptation.
Digital Progressive or Freeform Progressive lenses are the next step forward in progressive lens design. Rather than just a narrow corridor as in conventional progressive lenses, computer algorithms are utilized to design lenses from scratch which are customized to the patients exact prescription and eyeglass lens dimensions while taking into account pupil position. This allows for a much wider zone of clear vision and easier adaptation especially for patients who use the computer frequently.
Digital/Freeform Single Vision
Freeform lens technology can also be applied to single vision lenses. By creating single vision lens using computer algorithms based on the patients exact prescription, eyeglass lens dimensions, and pupil position higher definition vision with less glare, less aberrations, and better contrast is achievable. This is especially beneficial for patients with high refractive errors and astigmatism.
Anti-fatigue lenses are an excellent example of freeform technology being used to reduce eyestrain at near. By creating a customized “near-boost” in the inferior portion of the lens during design computer users, avid readers, and smart phone addicts receive a much needed reduction in eye strain. These lenses are great from patients up to approximately age 39 above which digital progressives are more suitable.
Lens Coatings and Tints
Lens coating technology has advanced to allow us to protect our eye health and for maximum visual performance in today’s demanding work and outdoor environments. Most of the lens technologies below can be applied to both prescription and non-prescription eyeglasses and customized to the eyeglass frame of your choice.
Scratch coating reduces your eyeglass lens susceptibility to scratches from everyday wear and tear. Its important to note that storing your eyeglasses in a case and cleaning them with cotton or microfibre cloth is still important to reduce the likelihood of scratching.
Ultraviolet protection is one of the most important aspects of eyeglasses and sunglasses as can help to prevent a variety of eye diseases including cataracts, retinal conditions, and growths of the eye surface.
Anti-glare coating can be applied to lenses in order to minimize unwanted glare. This results in more comfortable vision, less glare from computer and electronic screen, and less glare from oncoming headlights when driving at night.
Photochromatic lenses, most commonly Transitions brand, change in colour as we move from indoors to outdoors. The effect is most dramatic under bright sunny conditions as the technology relies on ultraviolet light to work. Its important to note that photochromatic lenses do not often darken signifiantly when inside vehicles as their windscreens typically block UV light.
Tinted and Polarized Lenses
Sunglass tint can be applied to any prescription glasses in a variety of customized colours. Polarized sunglass lenses significantly reduce glare by eliminating reflected light rays coming in from unwanted angles. Most Maui Jim and some Ray Ban prescription sunglasses are polarized, we also offer custom polarized sunglasses in your prescription and frame choice.
Blue Blocker Lenses
Blue blocker coating can be applied to almost all prescription eyeglass lenses. It is very effective in reducing unwanted blue wavelength lights from electronic screens. This greatly reduced patient fatigue for avid computer, tablet, and cell phone users. Blue blocker lenses have also been shown to possibly help improve sleep performance for patients who use electronic devices late at night by reducing the effect of blue light confusing the brain into thinking its daytime.
OPTIVIEW Eye Clinic – Doctors of Optometry
106 – 7500 120th Street
Surrey, BC, V3W 3N1