Table 3.

Order effect (preference by order in which eyes operated on)

Preferred eye	LASIK (n=67)	PRK (n=61)	Combined sample (n=128)
Right (first) eye	29 (43)	28 (46)	57 (45)
Left (second) eye	27 (40)	20 (33)	27 (37)
No preference	11 (16)	13 (21)	24 (19)
Adjusted OR* (95% CI), odds of preferring first eye to second eye	OR 1.80	OR 1.38	OR 1.53
	95% CI 0.78–4.11	95% CI 0.63–3.01	95% CI 0.88–2.67
P-value	0.16	0.42	0.13

Note:

^*After dropping the “no preference” patients, and then controlling for topical anesthetic in a mixed effects logistic regression model.

Abbreviations: CI, confidence interval; OR, odds ratio; LASIK, laser in situ keratomileusis; PRK, photorefractive keratectomy.