The Effect of Corneal Light catter on Viion After Penetrating Keratoplaty Original Reearch Article

Purpoe To determine the effect of corneal light catter on viion after penetrating keratoplaty (PK). Deign Cro-ectional tudy. Method etting: Cornea ervice at Mayo Clinic, Rocheter, Minneota. tudy population: ixty-one eye with clear graft at 14.6 ± 10.5 year after PK; 12 eye with late endothelial failure (LEF) at 19.7 ± 6.4 year after PK; 41 normal eye. obervation procedure: PK. main outcome meaure: Backcatter from different depth of the cornea wa meaured by a cutom catterometer; intraocular forward light catter wa meaured with a tray light meter; high-contrat viual acuity (HCVA) wa meaured by Early Treatment Diabetic Retinopathy tudy (ETDR) or nellen chart; meopic and photopic low-contrat viual acuity (LCVA) were meaured with a 10% contrat chart. Reult Backcatter from the anterior, middle (troma), and poterior third of the cornea wa higher in clear graft compared with normal (P < .001), and higher in graft with LEF compared with clear graft (P < .001). Corneal tromal backcatter from clear graft correlated with time after keratoplaty (r = 0.21; P = .006; n = 61). Forward light catter wa higher in eye with clear graft compared with normal (P ≤ .006), and higher in eye with LEF compared with clear graft (P ≤ .01). Corneal tromal backcatter from clear graft correlated with HCVA (r = 0.34; P = .02; n = 52), meopic LCVA (r = 0.36; P = .01; n = 28), and photopic LCVA (r = 0.57; P < .001; n = 28). Forward catter in eye with clear graft correlated with photopic LCVA (r = 0.38; P = .04; n = 26). Concluion Light cattered from the cornea increae with time after PK and i aociated with decreaed high- and low-contrat viion.