Seeing clearly. That is something we all deserve, right? So waste no more time in putting off finding out if Lasik is right for you. Imagine life free from the hassle of contacts or glasses!
Who is LASIK eye surgery for?
About 80 percent of the adult population is a candidate for LASIK eye surgery. Many of them share key traits:
Have a common vision problem (e.g., astigmatism, farsightedness, nearsightedness)
Lead active lifestyles
Cannot or prefer not to wear glasses and/or contact lenses
Are in general good health
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http://www.fda.gov/downloads/MedicalDevices/ProductsandMedicalProcedures/SurgeryandLifeSupport/LASIK/UCM421192.pdf
http://lib.post.ca.gov/Publications/Vision.pdf
Candidates should read at least one line in which they can identify all five letters. It
can be helpful to instruct candidates to start with the smallest line of letters that they
can read easily. They should proceed to successively smaller acuity lines until they
are unable to correctly identify any letters on a line. They should be encouraged to
guess when letter recognition becomes difficult. It is helpful to have a score sheet
that corresponds to the chart for recording accuracy.
11. Candidates should be given credit for each letter properly identified. Record the
acuity line in which at least 3 of the 5 letters are correctly identified. Include a +/-
notation to precisely convey the number of letters properly identified. For example, if
the candidate read the entire 20/30 line and one additional letter on the 20/25 line,
the acuity would be 20/30+1. Identifying all of the 20/30 line and 3 of the 5 letters on
the 20/25 line would result in an acuity of 20/25-2. Since the charts have 5 letters
per acuity line, the +/- value will never exceed a value of 2.
Letters which are properly identified on a smaller line compensate for letters missed
on a larger line. For example, if a candidate reads 4 of 5 letters on the 20/30 line
and 2 of 5 on the 20/25 line, the score would be 20/30+1.
The measured acuity should be compared to the agency stand
http://www.fda.gov/downloads/MedicalDevices/ProductsandMedicalProcedures/SurgeryandLifeSupport/LASIK/UCM419443.pdf