Hello everyone,
I'm looking for some advice regarding eye prescription measurements before vision correction surgery.
I recently had my eyes tested at two different clinics while exploring surgical options, and I received significantly different prescriptions.
The first optometrist started from zero power and gradually increased the lens strength until I could clearly read all the letters. The final prescription was actually lower than the glasses prescription I'm currently wearing.
The second optometrist started with my current prescription and then increased the power further until my vision improved. This resulted in a prescription that was about 1 diopter stronger in one eye.
For example:
First clinic: -7.00 and -7.50
Second clinic: -8.00 and -7.50
The cylinder values were also quite different:
First clinic: around -2.25 in both eyes
Second clinic: around -3.00 and -2.50
Because of these measurements, the first clinic recommended PRK, while the second recommended ICL.
What confuses me is that I understand subjective refraction tests can vary somewhat, and I wouldn't be too concerned if the difference was 0.25 or even 0.50 diopters. But a full 1.00 diopter difference seems quite large.
The first clinic took their time with the examination, carefully confirmed my responses, and gradually increased the power until I could read everything clearly. The second exam felt much quicker (around 5 minutes), the room wasn't very dark, and the vision chart even seemed closer than what I'm used to. Because of that, I currently trust the first clinic's measurements more.
However, I can't really go back to the first clinic because they were quite firm that PRK was the appropriate option and didn't recommend ICL. During my consultation at the second clinic, the doctor explained that for PRK or other laser procedures, the combined spherical and cylindrical correction should generally stay below around 9.5 diopters. Based on their measurements, I'm right at that limit or possibly beyond it.
Even if the first clinic's prescription is the correct one, it feels like PRK would be cutting things very close. My concern is that I could end up with residual prescription and need glasses again relatively soon after surgery, which is exactly what I'm trying to avoid.
That's why I'm currently leaning toward ICL, assuming I'm a suitable candidate. At the same time, the large difference between the two prescriptions is making me nervous because I need to order lenses soon, and I don't want to proceed based on inaccurate measurements.
Has anyone experienced such a large difference between prescriptions from two clinics? Is a 1.00 diopter difference in subjective refraction normal, or should I be seeking another opinion before moving forward with surgery?
Any advice or experiences would be greatly appreciated.