alohadaniel wrote:Anyone could tell me what's the meaning of 6/6 and 180?
The 180 is the direction of your astigmatism with 0 degree at the left and 180 degree at the right when facing your eyes. See
prescription.
If you are outside of the United States, the 6/6 would mean that with this correction you see an object 6 meters away from you with the clarity a normally sighted person would see an object 6 meters away. 6/6 is the same as 20/20. 20/20 is 20 feet with clarity of 20 feet.
alohadaniel wrote:The doctor told me I m not suitable for LASIK definitely right now.
This is correct.
alohadaniel wrote:I was quite dissapointed and forgot to ask is there any other surgery could save me? LASEK? PRK?
Let's do some basic math. Every diopter of correction over a 6.0mm conventional ablation treatment zone will remove 12 microns of tissue. Your worst eye would require about 125 microns of tissue removal.
A minimum of 250 microns of cornea must remain untouched to maintain stability in a healthy cornea.
Even the thinnest possible Lasik flap created with a femtosecond laser would be 100 microns thick.
So, your right eye is 460 microns thick, subtract the 100 microns for a flap, subtract 125 microns of tissue removed, and you have 235 microns remaining. Your cornea would be unstable.
A surface abltion technique would eliminate the Lasik flap and you would have 335 microns of cornea remaining. That is within the recommended minimum.
With such high refractive error, it is highly likely you will regress and require enhancement surgery. Regression of no more than 2.00 diopters would be a reasonable expectation. That is another 24 microns of lost tissue.
If you require a larger treatment zone than the 6.0mm we have used in our example, then the amount of tissue per diopter of correction goes up exponentially. A 6.5mm optical treatment zone would require about 18 microns of tissue per diopter of change. Now you would have 155 microns untouched with Lasik and 255 microns with a surface ablation like PRK, LASEK, or Epi-Lasik...plus another 30 or so for enhancement. You would not be able to have a larger ablation zone and this may be important due to
Lasik and night vision problems.
If you elect to have wavefront-guided ablation rather than conventional ablation, more tissue would be removed.
It is clear that Lasik is out. A surface ablation technique like PRK, LASEK, or Epi-Lasik may be possible, but you are really thinning an already thin cornea and this may not be wise.
alohadaniel wrote:Now I m thinking about having contact lenses since there is nearly no hope for me to get my eyes better by surgery.
This is a reasonable and wise alternative. The technology of newer contact lenses is improved over the previous models.
alohadaniel wrote:...now I am 20
Your age actually brings up an issue about your corneal thickness. You should be carefully checked for a corneal disease called keratoconus. This causes weakening and thinning of the cornea and normally presents before the fourth decade of life. Keratoconus tends to run in families, so if any of your family has it or required corneal transplants, you may be at elevated risk. Keratoconus with thin corneas would be a contraindication for Lasik and even PRK, LASEK, or Epi-Lasik.
alohadaniel wrote:Is there any possiblility that the corneas was getting thiner and thiner during that period because of the not so healthy use of contact lenses?
Don't misuse your contacts and the probability of contact lens induced corneal thinning is low in a healthy cornea. Discuss the specifics with your doctor.