Mar 30 2010
If my contact lens prescription is almost the same, would my glasses prescription have changed?
My glasses prescription last year was -4.25 and -4.00 with moderate astigmatism in both eyes.
And my contact lens prescription last year was -4.25 and -4.25
This year my contact lens prescription has not changed. Does that mean my glasses prescription has not changed either? Also this is the first time it hasn’t changed. Does this mean my vision is finally stabalising? I’m 24, had glasses since I was 6/7.
Since your contact lens prescription was -4.25 in both eyes then it is a certainty that your astigmatism correction must have been just around -1.00 diopter. The reason for that is that once your prescription hits the power of 4 either as a myope (near sighted) or a hypermetrope (far sighted) a small correction needs to be made to compensate for what is called the vertex distance or the distance between your cornea and the lens of the machine that the eye doctor uses to examine you. So normally your contact prescription should have been -4.00 & -3.75 once corrected for vertex. However in your case the eye doctor elected to compensate for your astigmatism using a sphere equivalent so that he/she can keep your costs down and use a regular spherical lens to provide you with an acceptable vision result. The classic method with the sphere equivalent calculation is that you take 50% of the astigmatism and add it to the overall contact lens power. And so you have the final prescription that you are wearing.
I have naturally BLUE eyes.
With the arrival of the summer season, there is little doubt vendors will again be out in force, trying to take advantage of unsuspecting teens by selling them illegal colored contact lenses.
Here is how you take off yur contact lenses without touching any part of your eye!!
Why you need to have your contacts evaluated periodically, and what I am looking for.
Here was the original request, sent to me by personal message (sorry for misspellings):
Learn how to wear colored contact lenses in this free eye care video.
How long contact lenses last will depend on the manufacturer, how thick the contact is and how much protein the patient makes. Choose between monthly, two week and daily contact lenses with advice from an ophthalmologist in this free video on contact lenses.
Did you know that in the United States, you must have a prescription for any type of contact lenses, whether you need vision correction or not? If you answered no then you are not alone. In fact, the New Jersey Society of Optometric Physicians (NJSOP) has received many reports of patients (especially teenagers) who suffered from severe eye problems as a result of having purchased and used plano (non-prescriptive) cosmetic lenses from a non-physician. The worst part is that not only are these types of lenses being sold illegally to unsuspecting consumers, but they are also being sold without the proper instructions on how to use them.