Eye-deology Vision Care: Edmonton Optometrists, Opticians and Eyewear

Understanding Your Eyeglass Prescription: Be Clear

YYour eyeglass prescription heavily influences the lens design, type, and refractive index required to see your best. Understanding the various parameters that comprise an eyeglass prescription can help better appreciate the need for and difference between particular lens features and designs. As a general rule, the higher the eyeglass prescription, or the higher the imbalance between eyes that an individual has, the greater the need for more advanced, personalized lenses. Many of these advanced lens designs are only available through dedicated eye care providers, like eye-deology Vision Care.

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  • OD refers to the right eye.
  • OS refers to the left eye.
  • Sphere is the amount of lens power, measured in diopters, prescribed to correct for nearsightedness (-) or farsightedness (+).
  • Cylinder is the lens power required to correct for astigmatism.
  • Axis is the lens meridian at which cylinder power is applied.
  • Add is the added magnifying power applied to the bottom part of multifocal lenses required to correct presbyopia.
  • Prism is the amount of prismatic power, measured in prism diopters, prescribed to compensate for eye alignment issues.

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Your Eyeglass Prescription

A common misconception is that only a prescription is required to pursue eyewear that meets your needs. While most certainly important and essential to purchase prescription glasses, a considerable amount of additional information is needed to craft exceptional eyewear. In addition to your prescription, our eye care and eyewear professionals factor for the following to personalize eyewear specifically for you:

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A Prescription Is A Piece of the Eyewear Puzzle

Eyeglass prescriptions should not be considered a one-size-fits-all plan that addresses ALL of an individual’s vision needs. That is certainly the case for individuals with an eyeglass prescription requiring multifocal lenses. For example, an eyeglass prescription established to provide clear sight for most activities would be considerably different than one prescribed to maximize clarity and field of view for a specific task, such as computer work. In addition to considering activities and focal lengths, an eyeglass prescription can sometimes include details about recommended eyeglass lens brand or design (i.e., capabilities). Be mindful that the lens brand and design prescribed may not be available everywhere.

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Computer Glasses

Great vision depends on the eyes working effectively together along with the brain. That requires the corrective needs of each eye be evaluated individually and in relative terms to the other. That is something to be mindful of if the difference in prescriptions between your eyes is significant AND you are considering over-the-counter "readers" as a solution OR if you require multifocal lenses.

Progressive lens users need to use different areas of the lens depending on the activity. As a result, presbyopic patients with differing prescriptions in their eyes need the brain to work extremely hard to "even out" and "combine" the images each eye is processing. That is because their eyewear provides different images when using anything but the central position on their glasses. That creates discomfort and patient vision that is only clear when covering one eye or the other. Binocular Harmonization Technology (BHT) corrects this.

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Binocular Harmonization Technology can correct for prescription imbalances between eyes

Like pharmaceutical prescriptions, eyeglass prescriptions are designed and intended for use by only qualified professionals - optometrists, ophthalmologists, and licensed opticians. Accordingly, they should not be changed or altered by anyone other than the prescribing doctor unless a subsequent eye exam is received. Personalized prescription eyewear is considered a highly calibrated and finely tuned medical device. Therefore, changes to prescriptions in the absence of an optometrist or ophthalmologist can produce unintended consequences to visual acuity, stereoscopic vision, balance, and an individual's overall safety and wellbeing.

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Prescripiton Eyeglasses Crafted By Professional Opticians in Edmonton


Doctor Jennifer Ash, Eye Doctor (Edmonton)

Dr. Jennifer Ash is the Resident Optometrist at Eye-deology Vision Care. Dr. Ash provides patient care 5 days a week. Read more about Dr. Ash.

Doctor Sarah Virji, Eye Doctor (Edmonton)

Dr. Sarah Virji is an Associate Optometrist at Eye-deology Vision Care. Dr. Virji regularly provides patient care Thursdays and Saturdays. Read more about Dr. Virji.

Doctor Ruhee Kurji, Eye Doctor (Edmonton)

Dr. Ruhee Kurji is an Associate Optometrist at Eye-deology Vision Care. Dr. Kurji provides patient care Tuesdays & Fridays. Read more about Dr. Kurji.

Doctor Jade McLachlin, Eye Doctor (Edmonton)

Dr. Jade McLachlin is an Associate Optometrist at Eye-deology Vision Care. Dr. McLachlin provides patient care 5 days a week. Read more about Dr. McLachlin.