Comparative analysis of safety and efficacy of photorefractive keratectomy versus photorefractive keratectomy combined with crosslinking

Figures & data

Figure 1 Preoperative corneal tomography of a patient seeking refractive correction for −2.50 D. Corneal tomography demonstrates a reduced pachymetry with no other abnormalities. The patient underwent PRK combined with CXL.

Abbreviations: CXL, corneal collagen crosslinking; OD, oculus dexter [right eye]; PRK, photorefractive keratectomy.

Figure 2 Preoperative corneal tomography of a patient seeking refractive correction; −3.50 D. Corneal tomography demonstrates an inferior superior asymmetry (A) with an overall D of red (B).

Abbreviation: OD, oculus dexter [right eye].

Table 1 Demographics and patient characteristics

Demographics and characteristics	Group A (PRK-CXL): 109 eyes	Group B (PRK alone): 118 eyes	P-value
Age (years)	24.19±3.542	25.92±4.906	0.003
Male:female ratio	0.75:1	0.53:1	0.195
Preoperative MRSE (D)	−3.64±1.436	−3.38±1.647	0.28
Postoperative MRSE (D)	−0.04±0.197	−0.01±0.102	0.153
Preoperative CCT (µm)	477.7±19.31	479.7±29.37	0.556
Postoperative CCT (µm)	417.4±30.12	427.2±21.15	0.021
Preoperative endothelial cell count (cells/mm^2)	2,514.3±180.7	2,602±201.1	0.72
Postoperative endothelial cell count (cells/mm^2)	2,497±168.3	2,591.4±187.2	0.69

Abbreviations: CCT, central corneal thickness; CXL, corneal collagen crosslinking; MRSE, mean refractive spherical equivalent; PRK, photorefractive keratectomy.

Figure 3 Change in corrected visual acuity, as number of eyes with gain/loss in Snellen lines of corrected distance visual acuity 1-year postoperatively.

Abbreviation: PRK, photorefractive keratectomy.

Figure 4 Refractive stability in both groups during 1 year follow-up.

Abbreviation: PRK, photorefractive keratectomy.

Figure 5 Keratometric stability in both groups during 1 year follow-up.

Abbreviation: PRK, photorefractive keratectomy.