2

Question 1

discontinuation of soft contact lenses for at least

Answer 1

3 days to 2 weeks (toric lenses may require longer)

Question 2

discontinuation of rigid contact lens for at least

Answer 2

2–3 weeks

Question 3

Monovision

Answer 3

dominant eye is corrected for distance, and the nondominant eye is corrected to approximately –1.50 to –1.75 D

Question 4

mini-monovision

Answer 4

near-vision eye is corrected to approximately –0.75 D, which allows some near vision with better distance vision and less anisometropia

Question 5

Patients with epithelial basement membrane dystrophy

Answer 5

not ideal candidates for LASIK and may be better candidates for surface ablation, because removal of the abnormal epithelium may be palliative

Question 6

Minimal residual stromal bed

Answer 6

250 μm

Question 7

Do not do LASIK if corneal thickness is less than

Answer 7

480 μm

Question 8

RSB is calculated

Answer 8

by subtracting the sum of the flap thickness and the calculated laser ablation depth from the preoperative corneal thickness

Question 9

Main disadvantage of redial keratotomy

Answer 9

Continuing long-term instability of the procedure. A hyperopic shift of 1.00 D or greater was found in 43% of eyes between 6 months and 10 years postoperatively. edema causes flattening of the cornea (and hyperopic shift) upon awakening. increases spherical aberration