Femtosecond-Assisted Laser in situ Keratomileusis with de novo Flap Creation Following Previous Microkeratome Laser in situ Keratomileusis

Figures & data

Table 1 Modified Femtosecond LASIK Flap Settings Compared to the Default Manufacturer Settings on the FS200 Femtosecond Laser

Femtosecond Laser Parameter	Default Manufacturer Femtosecond Laser Flap Settings	Enhanced Post-LASIK Femtosecond Laser Flap Settings
Bed Cut Energy (µJ)	0.8	1.4
Bed Cut Spot Separation (µm)	8.0	6.0
Bed Cut Line Separation (µm)	8.0	6.0
Side Cut Energy (µJ)	0.8	0.8
Side Cut Spot Separation (µm)	5.0	5.0
Side Cut Line Separation (µm)	3.0	3.0

Table 2 Baseline Characteristics and Demographic Features of the Study Population

Preoperative Characteristics and Demographics	Means with (Standard Deviations)
Age (years)	52.0 (9.8), Range = 32 to 68
Gender	17.6% Male and 82.4% Female
Preoperative uncorrected visual acuity (logMAR)	0.48 (0.24), Range = 0.2 to 1.0
Preoperative best spectacle corrected visual acuity (logMAR)	0.02 (0.06), Range = 0 to 0.2
Preoperative Refractive Error Spherical Equivalent (diopters)	+0.16 (1.54), Range = −3.0 to +2.1
Time since Previous LASIK Surgery (years)	11.5 (7.0), Range = 1 to 20
Optical Coherence Tomography-measured Preoperative Total Corneal Thickness (microns)	516.5 (35.3), Range = 452 to 576

Figure 1 Standard refractive surgery graphs. (A) Uncorrected distance visual acuity. (B) Change in corrected distance visual acuity. (C) Spherical equivalent attempted vs achieved. (D) Spherical equivalent refractive accuracy. (E) Refractive astigmatism. (F) Stability of spherical equivalent refraction.