Wavefront-Guided Photorefractive Keratectomy with the Use of a New Hartmann-Shack Aberrometer in Patients with Myopia and Compound Myopic Astigmatism

Table 4

Stability of refraction ().

	1 week to 1 month	1 month to 3 months
Change in sphere by ≤0.5	82.9% (549 eyes)	92.1% (610 eyes)
Change in sphere by ≤1.0 D	95.0% (629 eyes)	98.9% (655 eyes)
Mean change in sphere ± SD	−0.01 ± 0.53	−0.02 ± 0.35
( value)	()	()
95% CI	−0.05 to 0.03	−0.05 to 0.01
Change in Cyl by ≤0.5 D	74.9% (496 eyes)	87.0% (576 eyes)
Change in Cyl by ≤1.0 D	93.5% (619 eyes)	98.8% (654 eyes)
Mean change in Cyl ± SD	−0.02 ± 0.66	+0.19 ± 0.38
( value)	()	()
95% CI	−0.07 to 0.03	0.16 to 0.22
Change in MSE by ≤0.5 D	82.8% (548 eyes)	89.3% (591 eyes)
Change in MSE by ≤1.0 D	96.7% (640 eyes)	99.1% (656 eyes)
Mean change in MSE ± SD	−0.02 ± 0.48	+0.07 ± 0.34
( value)	()	()
95% CI	−0.06 to 0.02	0.04 to 0.10

MSE: manifest spherical equivalent; D: diopter; SD: standard deviation; CI: confidence interval; Cyl: cylinder.
Cylinder recorded in “minus” form. Positive change means reduction in manifest cylinder.