Aneeq Ullah Baig Mirza.
Comparison of Photorefractive Keratectomy results in two myopia groups.
Pak J Med Res Jan ;46(1):22-6.

Aims: To compare the visual results and complications after photorefractive keratectomy (PRK) in mild to moderate and severe myopia groups. Setting: A private setting in Model Town, Lahore, from February 2004 to June 2005. Patients and Methods: Two hundred patients (400 eyes) underwent PRK on Summit Apex Plus excimer laser. Complete preoperative eye examination was done including BCVA (best-corrected visual acuity). Three months postoperatively, the UCVA (uncorrected visual acuity) and complications in each eye were recorded. The eyes were divided into group I (<=-6.00D) and group II (> -6.0D) myopia retrospectively. Results: Out of 400 eyes 324 (81%) belonged to group I and 76 (19%) to group II. In group I, prelaser BCVA was 6/6 in 87% and 6/9 in 7.7% . In group II, 61.8% of eyes had 6/6 BCVA and 15.8% had 6/9 vision. In group I, post laser UCVA was 6/6 in 79% and 6/9 in 12% while in group II it was 44.7% and 25% respectively. Some of the eyes had a prelaser BCVA of <6/6 but postlaser UCVA was equivalent to prelaser BCVA. This was designated as comparable vision. In group I, a total of 275 eyes out of 324 had a post laser UCVA of 6/6 or comparable vision (to the pre laser BCVA), while in group II 52 eyes out of a total of 76 had a post laser UCVA of 6/6 or comparable vision (statistically significant. In group I 10.8% of eyes lost 2 or more lines of UCVA postoperatively while in group II it was 21.1% (p<0 .021). Post laser complications were seen in 86 out of 324 eyes in group I and 36 out of 76 eyes in group II (p<0.0001). Moderate haze and scarring was each seen in 3.9% of the eyes in group II, and none in group I. The occurrences of under correction, overcorrection and complaints of poor contrast, glare were seen more in group II than in group I. d effective with minimal complications in myopia of less than minus 6.0 D when compared to that of more than minus 6.0 D myopia and the differences were statistically significant.

PakMediNet -Pakistan's largest Database of Pakistani Medical Journals - http://www.pakmedinet.com