How do I know if my vision has been stable enough over the past year to be a good candidate for LASIK?Eye & LASIK
I am 22 years old and thinking of refractive surgery. How do I know my prescription has been stable enough for the past year to make the procedure worthwhile? Should degree changes of .25 or .5 affect my decision of doing LASIK?
Visual stability is suggestive when your prescription has remained the same or similar over at least 12 months.
A difference of 0.25 to 0.50 diopter is still within the realms of margin of error during subjective refraction (i.e. is considered acceptable difference to indicate stability).
Dr David Chan
Generally speaking, we would like the 'overall' spectacle power to be within +/- 0.25D as that is the margin of error in measurements. That is to say, differences of this amount are not considered significant.
When we say 'overall' power, that is because sometimes certain measurements may seem to show more astigmatism and less myopia, or the other way around. In such cases, if the 'spherical equivalent' that takes into account both myopia and astigmatism is essentially the same, the spectacle power may still be considered stable even if individual components seem to vary by a bit more.
Also, in another special situation, we worry less if a recent measurement shows less myopia than a previous one. This is because eyes generally do not become less myopic/shortsighted on their own. If an eye seems less shortsighted by eg 0.50D, it may have been that the previous measurement was 'overcorrecting' the real shortsightedness, therefore in fact the spectacle power is most likely to be stable.
At the end of the day, do discuss these concerns with the doctor performing your examination. As you can see from the above, the assessment as to whether a spectacle power is stable or not is sometimes not so straightforward.
LASIK Or TransPRK? Only 1 Of Them Is Singapore Military-Approved, Here's Why
Dr Tony Ho is here to cast a big bright light on the subject. He has garnered 25 years of speciality experience in the Singapore refractive surgery...READ MORE
LASIK Costs In Singapore: An Eye Doctor Tells All
Singapore has one of the highest rates of myopia in the world, which probably explains why you're interested in this article. The good news for you?...READ MORE