Excimer laser photorefractive keratectomy for hyperopia: 7.5-year follow-up

Abstract

In H-PRK, refractive stability achieved at 1 year was maintained up to 7.5 years with no evidence of hyperopic shift, diurnal fluctuation, or late regression. Peripheral corneal haze decreased with time but was still evident in a number of eyes at the last follow-up visit.

Long-Term Efficacy of Photorefractive Keratectomy In Hyperopia Patients

“…The density of haze was lowered in 12-24 months. Peripheral haze stays persistent in eyes with higher dioptric correction [18][19][20][21][22][23][24][25][26]. In our study, we detected corneal haze in 6.57% of patients in group 1 and 31.57% of patients in group 2.…”

“…A study by O'Brart et al, demonstrated that after 7.5 year follow-up period in eyes that received hyperopic PRK treatment, 65% had stable or increased BCVA levels. However 30% had one line vision loss, and 5% had two lines vision loss during this period [22]. Pacella et al, revealed that 92.8% of eyes had stable or increased BCVA levels, while 25% of eyes had 2 or more lines of vision loss on 7 th day of the hyperopic PRK treatment.…”

“…A study by Jackson et al, reported lower haze rates in low-medium grade hyperopia groups compared to high grade hyperopia group [15]. In myopic PRK, subepitheal haze occurs in central cornea reaching maximum levels in 3-6 months [21][22][23][24][25]. In hyperopia ablation was performed from the peripheral cornea.…”

“…Pacella et al, found UCVA values in last control appointment as 20/20 or better in 13 eyes and 20/32 in all eyes. Efficacy index was calculated as 0.93 (9,(22)(23)(24)(25)(26). In our study results, efficacy index was calculated as 0.92 in low grade hyperopia group and 0.79 in high grade hyperopia group.…”

Sixteen-year follow-up of hyperopic laser in situ keratomileusis

“…This is of particular relevance in the case of refractive surgery, which is directed at treating natural physiological variants rather than disease processes and especially important with the correction of hyperopia, as this condition not only tends to progress with age but becomes more symptomatic with developing presbyopia (17) . However, despite millions of 5 corrections having been performed world-wide over the past two decades, studies examining the long-term follow-up of hyperopic excimer laser procedures beyond 5 years are few with none beyond 10 years (18)(19) . The refractive and biomechanical stability of the cornea decades after such procedures, where the ablation and removal of tissue is in the corneal mid-periphery, nearer to the limbus than in myopic corrections, is unknown.…”