LASIK-Induced Posterior Vitreous Detachment
Mirshahi A.1,2, Gerhardt D.1, Terzi E.1, Kasper T.1, Kohnen T.1
1University Eye Department, Frankfurt/Main
2Centre of Ophthalmology, Recklinghausen
Purpose: Vitreoretinal complications are very rare in laser in situ keratomileusis. Increase of intraocular pressure caused by the suction ring with subsequent deforming of the bulb and excimer laser shock during the ablation have been discussed as possible causes. The purpose of this study was to determine the effect of LASIK on the vitreous body.
Method: In a prospective study we performed ocular ultrasonography (B-scan) immediately before and one week after LASIK procedure in 28 myopic eyes (15 patients, mean age 36 y, 5 m, 10 f). Particularly the prevalence, localisation and extent of posterior vitreous detachment (PVD) was determined. The average spherical equivalent was 4,9 dpt (range, -2.38 -8.38), the average antero-posterior bulb length was 25.02 mm (range, 23.94 26.79).
Results: 21 eyes had no PVD preoperatively. Five eyes out of this group (3 patients, 23.8%) experienced incomplete PVD as assessed one week postoperatively. Eight eyes (28.6%) had a partial PVD preoperatively and in one eye extension of vitreous detachment was observed after the surgery. The axis length and the spherical equivalent was in four of affected eyes clearly above the average (more myopic).
Conclusions: LASIK induces posterior vitreous detachment in a significant number of eyes as seen on
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