About 0.25 diopter is considered within normal human fluctuation.
A technical point: “Regression” in Lasik means that after surgery your eye moves back toward your original refractive error. Lasik regression is common when correcting myopia (nearsighted, shortsighted) over about 6.00 diopters and virtually all hyperopia (farsighted, longsighted) correction. What you are describing is the natural progression of your myopia. Actually, the appearance
of a natural progression of myopia. Read further why I emphasize appearance.
A quick and important point that if your eye prescription is for contact lenses it will likely be lower than if it is for glasses. If you look at one prescription for contacts and compare it to another for glasses, you could easily be 1.00 diopter off.
aaa wrote:I He also said that to eliminate another possibility (not sure what it is, I should have asked), they put two drops into my eyes - so that I could not focus and enlarged my pupils (I dont know the name of the drops). After that, they check my vision again, and it does not really change. So they think it's good.
This is excellent.
The natural crystalline lens within the eye is able to change shape and thereby change focus. This process of changing focus is called accommodation. In a natural and relaxed state, a normal eye is focused for distance vision (beyond about 20 feet/6 meters). To see objects close, a normal eye must accommodate.
The most common form of myopia is when the eye is longer than normal. In a relaxed state, the light entering the eye focuses in front of the retina, the light sensitive membrane on the back of the eye.
A manifest refraction is when the doctor uses different lenses (which is better, one or two?) to determine your best corrected visual acuity (BCVA). A limitation of the manifest refraction is that you are able to accommodate. That means that you may actually “focus around” some of your myopia through accommodation. This can provide an eye presctiption that is actually lower than your true myopia.
Up until about age 8-10 we have a tremendous amount of accommodation. This is a contributing factor why many myopes don’t need glasses until around this age. Our young eyes are able to “focus around” the myopia. After around age 8-10 the natural crystalline lens is less able to change shape and we start to have less accommodation. The reduction of accommodation is called presbyopia. Presbyopia continues throughout our lives, but is not really noticed until around age 40 we are much less able to accommodate enough to see close objects and need reading glasses or bifocals.
A cycloplegic refraction is the same as a manifest refraction except eye drops paralyze the crystalline lens so you cannot accommodate...you cannot focus around your myopia. A cycloplegic refraction will measure your actual
The fact that your manifest refraction and cycloplegic refraction are the same is a very, very good sign. The fact that this particular doctor did a manifest and cycloplegic refraction is a sign of a much more comprehensive examination.
It is quite possible that during previous manifest refractions you were focusing to reduce your myopia, giving an eye prescription that misrepresented your actually refractive error.
Believe it or not, I oversimplified this explanation, but for now what is important is that your manifest and cycloplegic are the same.
aaa wrote:I did feel the drops for about 2 days - could not focus very well in the first few hours, and bad glaring on sunlight for more than 1 days. The clinic said it is possible, and no link the effect from the surgery.
Correct. Your pupils took a while to return to their normal and more constricted size and your crystalline lens took a while to regain accommodation. This is common.
Now, back to your “Should I Do It” question. I cannot give you that answer, but you already indicate that you understand the downside – enhancement surgery. If your eyes continue to change at the rate they appear to be changing, enhancement surgery in a few years seems probable. Keep in mind, the changes you note may only be the appearance of change. If your surgeon successfully corrects you, you won’t be trying to focus around your myopia.
There may be other issues that are causing an actual change in refractive error. I suspect your surgeon did a comprehensive examination for signs of ocular health problems. If anyone in your family has had eye problems, especially corneal transplant or must wear Rigid Gas Permeable (RGP) contact lenses to be able to see, you need to inform your doctor of the details.
I am obviously making assumptions without the benefit of detailed information from your examination, and I am not a doctor. Your doctor will be the best person to ask for a better explanation. I suggest you ask for an appointment or schedule a phone call to discuss your concerns, alternatives, and what in the opinion of your surgeon is best for you.