Contrast sensitivity after excimer laser photorefractive keratectomy for myopia / 国际眼科杂志(Guoji Yanke Zazhi)
International Eye Science
;
(12): 914-917, 2007.
Article
in Chinese
| WPRIM
| ID: wpr-641678
ABSTRACT
· AIM:
To evaluate contrast sensitivity in patients who had undergone uncomplicated excimer laser photorefractive keratectomy (PRK) for myopia.·METHODS:
Monocular contrast sensitivity function was measured with the CSV-I000E chart in 41 patients who had received PRK by the Nidek EC-5000 excimer laser system.Mean preoperative refractive error was -2.62±1.33 D (range,-0.75 to -4.00 D). Contrast sensitivity function was measured preoperatively, 1week, 1, 3 and 6months after surgery through the CSV-1000E contrast sensitivity unit (VectorVision).·RESULTS:
Logarithmic values of contrast sensitivity at each spatial frequency were used for statistical analysis and normalized values were used for graphical representation.Contrast sensitivity decreased 1 week and 1 month postoperatively. Starting from the first month, there was rapid recovery of contrast sensitivity especially at low spatial frequencies, and at the third month, only at 6 and 12 cycles per degree (cpd) statistically significant decrease was seen.Six months after surgery, there was an increase in contrast sensitivity values at ail spatial frequencies.·CONCLUSION:
Photorefractive keratectomy can induce significant reductions in contrast sensitivity in the first month after surgery; these values returned to the preopereative values at 6 months after surgery.
Full text:
Available
Index:
WPRIM (Western Pacific)
Language:
Chinese
Journal:
International Eye Science
Year:
2007
Type:
Article
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