Doctor insights on:
How Can I Tell How Bad My Vision Is From My Contact Lens Prescription
Look for the power: The prescription includes power, base curve, diameter. The higher the power, the stronger the prescription in either myopia (-) or hyperopia (+).See 1 more doctor answer
My contact lens prescription has changed twice in 9 mos. Because my close up reading vision has improved. Is this unusual for someone who is 59?
No: Your eyes may be changing as a result of nuclear sclerosis, which is hardening of your lens of your eye creating more nearsightedness. Your prescription would be changing as a consequence. Furthermore, the elasticity of the eye does change very gradually over time. Your eye doctor can help you with this and adjust as necessary. Btw, glaucoma treatments sometimes accelerate cataract formation too.See 1 more doctor answer
Close: Commonly it is slightly higer like -4.50 and -5.00 but this depends in part on the goal and how long since your last examination. Also at your age there is the issue of bifocals due to near vision needs. Useful to check with your ophthalmologist for the best information on this.
Are optometrists able to tell what my contact lens prescription are by just looking at your glasses?
No: Fitting of contact lenses involves more than just the power of your corrective lenses. The corneal curvature, size of your cornea and general health of the anterior surface of your eye are taken into consideration. How your eye tolerates a specific contact lens is determined during the followup phase of your fitting.See 1 more doctor answer
Depends: Prescriptions for glasses and contact lenses can change quite quickly, especially in younger individuals, and in those individuals performing lots of near-vision tasks like reading, computer use, or video games. It is also possible for diabetes and blood sugar changes to affect the prescription, and rarely certain medications can cause this too. Be checked by your eye md if your rx is changing.
Why?: The prescription is designed so the supplier of the lenses can get the proper ones for you. They are very specific. Why do you need to know it exactly yourself. If you are ordering on line, all the information should be there as well. The doctor who gave you the prescription can interpret it for you.
Training: If you cannot read it because the handwriting is bad, then ask for a replacement. If you want to understand what it means ask the ophthalmologist who wrote it. Otherwise your best bet is to attend opticianry school or medical school followed by an eye training program, and then you can understand the prescription.
Unlikely: Contact lens dispensers are obsessed with all the information being on the prescription so they can sell you the contacts, get the profit, but take absolutely no responsibility. So your prescription is for one type only and you will need to go to your ophthalmologist to get one for any other type of lens.
Your doc is needed: Depending how near are farsighted you are, there are special formulas to determine this. Your eye doctor should be able to give you a prescription for both.
My contact lens prescription is significantly different from my glasses prescription. Is this normal?
A small difference: Is normal. A significant difference would be unusual but it could just be the way it is written in a different format.See 1 more doctor answer
My contact lens prescription is different from my glasses prescription. Is it supposed to be like that?
Yes: The optical principle is lens effectivity. As any lens is moved away from your eye it becomes inherently more powerful (positive) the inverse is also true, as a lens is moved to eye, becomes weaker (negative). So contacts and glasses are adjusted accordingly only if it will affect the final clinical outcome.See 1 more doctor answer
Yes: Not an issue.Get a more detailed answer ›
Not correct: Eyeglasses and contacts lens prescriptions are not the same. There is a power difference since the glasses are farther from the cornea surface compared to contact lens. Thus you need a different prescription, plus contact lens requires a base curve and diameter in addition to the power.See 1 more doctor answer
Not everyone stable: In some people, the glasses and contact lens powers seem to change annually. These are usually younger patients and occasionally older patients with cataract formation. Usually, most people stabilize by their mid 20's. Drastic changes in refraction may mean problems such as keratoconous or cataract. Best to have a dilated exam.See 2 more doctor answers
Prescription: It expires when your prescription changes.Get a more detailed answer ›
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