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Near vision contrast sensitivity after photorefractive keratectomy
M J Hodkin1, M M Lemos, M B McDonald
1LSU Eye Center, Louisiana State University Medical Center, School of Medicine, New Orleans 70112, USA.
Background:
To evaluate near vision contrast sensitivity as a measure of visual performance after photorefractive keratectomy (PRK).
Setting:
LSU Eye Center, New Orleans, Louisiana.
Methods:
Using Holladay Contrast Acuity Test cards, near (reading) vision for five levels of contrast sensitivity was evaluated in a cross section of 53 eyes of 31 patients 25 to 732 days after PRK. Twenty-four normal eyes of 22 myopic patients served as controls.
Results:
Near contrast sensitivity decreased at all tested contrast levels for approximately 7 months after PRK and then returned to baseline. This phenomenon paralleled the fluctuation in best corrected distance Snellen acuity.
Conclusions:
These preliminary results indicate that Snellen visual acuity and near contrast sensitivity returned to baseline within 1 year after PRK.