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Volume 146, Issue 6, Pages 913-919 (December 2008)


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The Effect of Corneal Light Scatter on Vision After Penetrating Keratoplasty

Sanjay V. PatelaCorresponding Author Informationemail address, Jay W. McLarena, David O. Hodgeb, William M. Bournea

Accepted 9 July 2008. published online 09 September 2008.

Purpose

To determine the effect of corneal light scatter on vision after penetrating keratoplasty (PK).

Design

Cross-sectional study.

Methods

setting: Cornea service at Mayo Clinic, Rochester, Minnesota. study population: Sixty-one eyes with clear grafts at 14.6 ± 10.5 years after PK; 12 eyes with late endothelial failure (LEF) at 19.7 ± 6.4 years after PK; 41 normal eyes. observation procedures: PK. main outcome measures: Backscatter from different depths of the cornea was measured by a custom scatterometer; intraocular forward light scatter was measured with a stray light meter; high-contrast visual acuity (HCVA) was measured by Early Treatment Diabetic Retinopathy Study (ETDRS) or Snellen chart; mesopic and photopic low-contrast visual acuity (LCVA) were measured with a 10% contrast chart.

Results

Backscatter from the anterior, middle (stroma), and posterior thirds of the cornea was higher in clear grafts compared with normal (P < .001), and higher in grafts with LEF compared with clear grafts (P < .001). Corneal stromal backscatter from clear grafts correlated with time after keratoplasty (r = 0.21; P = .006; n = 61). Forward light scatter was higher in eyes with clear grafts compared with normal (P ≤ .006), and higher in eyes with LEF compared with clear grafts (P ≤ .01). Corneal stromal backscatter from clear grafts correlated with HCVA (r = 0.34; P = .02; n = 52), mesopic LCVA (r = 0.36; P = .01; n = 28), and photopic LCVA (r = 0.57; P < .001; n = 28). Forward scatter in eyes with clear grafts correlated with photopic LCVA (r = 0.38; P = .04; n = 26).

Conclusions

Light scattered from the cornea increases with time after PK and is associated with decreased high- and low-contrast vision.

a Department of Ophthalmology, Mayo Clinic, Rochester, Minnesota

b Department of Health Sciences Research, Mayo Clinic, Rochester, Minnesota

Corresponding Author InformationInquiries to Sanjay V. Patel, Mayo Clinic, 200 First Street SW, Rochester, MN 55905

PII: S0002-9394(08)00545-X

doi:10.1016/j.ajo.2008.07.018


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