Table 1.

Patient demographics and treatment data

	LASIK (n=67 patients; n=134 eyes)	PRK (n=61 patients; n=122 eyes)	Combined sample (n=128 patients; n=256 eyes)
Patient age, years
Mean ± SD (range)	33.5±7.1 (21–52)	32.1±6.9 (21–55)	32.8±7.0 (21–55)
Sex, n (%)
Male	28 (42)	29 (48)	57 (45)
Female	39 (58)	32 (52)	71 (55)
Preoperative spherical equivalent
Mean ± SD	−3.80±1.93	−3.81±1.69	−3.81±1.81
Laser used, n (%)
Allegretto	48 (72)	29 (48)	77 (60)
Visx	19 (28)	32 (52)	51 (40)
Order of operation, n (%)
Proparacaine eye first	35 (52)	36 (59)	71 (55)
Tetracaine eye first	32 (48)	25 (41)	57 (45)

Abbreviations: LASIK, laser in situ keratomileusis; PRK, photorefractive keratectomy; SD, standard deviation.