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J Fr Ophtalmol. 2005 Dec;28(10):1070-5.

[Prospective study of contrast sensitivity and visual effects after LASIK].

[Article in French]

Author information

1
Service d'Ophtalmologie, Pavillon C, Hôpital Edouard Herriot, 5, place d'Arsonval, 69003 Lyon. david.donate@wanadoo.fr

Abstract

PURPOSE:

To evaluate changes in visual effects (contrast sensitivity, halos, and glare) following laser in situ keratomilleusis (LASIK).

PATIENTS AND METHODS:

In this prospective study, 72 eyes had LASIK to correct myopia. Contrast sensitivity was tested preoperatively, as well as 6 and 12 months postoperatively. The spatial frequencies tested were 3, 6, 12, and 18 cycles per degree (c/d). There were two groups: group 1 for myopia between -6 D (n=30) and -7.5 D and group 2 for myopia between -7.5 D and -10 D (n=25). There were 17 cases with loss of sight. For each visit, pupil diameter, halos, and glare were measured.

RESULTS:

Contrast sensitivity was better in group 1 than in group 2 (p<0.05) (for spatial frequencies of 3, 12, 18, c/d). In group 1, contrast sensitivity decreased 6 months postoperatively for all spatial frequencies (p<0.05); 12 months after surgery the changes were not significant. In group 2, changes were not significant. For halos and glare, pre- and postoperative percentages were not different. There was no correlation with pupil diameter.

CONCLUSIONS:

After LASIK to correct myopia, there may be a persistent decrease in contrast sensitivity. Changes are only significant at 6 months postoperatively. Patients should be informed preoperatively of this possible decrease in functional vision.

PMID:
16395199
[Indexed for MEDLINE]
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