Laser in situ keratomileusis to correct myopia, hypermetropia and astigmatism after penetrating keratoplasty for keratoconus: a series of 27 cases

Safety and efficacy of a laser refractive procedure in eyes with previous keratoplasty: systematic review and meta-analysis

“…The number of studies that reported the proportion of eyes achieving 20/20 UDVA or better is 22. 15,16,25–33,37,39–43,45–48,51 Of 432 eyes in these studies, 9.49% achieved 20/20. Among LASIK studies, 11 reported this outcome and had a total of 247 eyes with 8.09% achieving 20/20.…”

“…Included studies were published between 1992 and 2022; 23 were prospective clinical trials and 8 were retrospective. 4,15,16,24–52 Almost all studies had 1 treatment arm, except the study by Huang et al, which had 2 arms. 36 Six studies were conducted in the United States; 5 in Brazil; 4 in Canada; 3 in Italy; 3 in Turkey; 3 in Germany; and 1 each in Australia, Egypt, Iran, Japan, Korea, England, and Spain.…”

“…Twenty-three studies reported patients' sex; the percentage of female patients was 43.6% of the total number of participants. 4,15,16,24,[26][27][28][29][30][31][32][33][35][36][37][39][40][41][43][44][45][46][47]49,50,52 Follow-ups ranged from 1 month to 56 months. Seventeen studies performed LASIK; 12 studies performed PRK, of which 2 performed additional refractive procedures (PTK, intrastromal corneal ring segments) and 1 performed laser-assisted subepithelial keratectomy (LASEK) on a comparison group.…”

“…Seventeen studies performed LASIK; 12 studies performed PRK, of which 2 performed additional refractive procedures (PTK, intrastromal corneal ring segments) and 1 performed laser-assisted subepithelial keratectomy (LASEK) on a comparison group. 4,15,24,27,[29][30][31]33,36,38,[41][42][43]45,47,48,[50][51][52] Three studies performed transepithelial PRK (trans-PRK). 25,37,42 Three of the included studies reported using multiple sequential laser ablations to reach the desired refraction.…”

“…The proportion of eyes with 20/40 UDVA or better was reported by 24 studies with 530 eyes, and the percentage was 46.79% overall. 4,15,16,[25][26][27][28][29][30][31][32][33]35,[37][38][39][40][41][42][43][44][46][47][48]51 For LASIK, 12 studies reported this outcome, with 51.85% of 270 participants having 20/40 or better. Among 226 eyes from 9 studies in which PRK was performed, 39.38% had 20/40 or better UDVA.…”