Potential acuity meter for predicting postoperative visual acuity in penetrating keratoplasty. A new method using a hard contact lens

W. E. Smiddy, T. H. Horowitz, W. J. Stark, P. Klein, G. P. Kracher, A. E. Maumenee

Research output: Contribution to journalArticle

Abstract

An irregular corneal surface degrades the optical transmission and limits the effectiveness of the potential acuity meter (PAM) in predicting post-keratoplasty visual acuity. The authors investigated the efficacy of using a temporarily placed hard contact lens to neutralize surface irregularities in conjunction with the PAM in predicting post-keratoplasty visual acuity. A prospective evaluation was performed on 40 keratoplasty patients with a mean follow-up of 10.4 months. Of 27 patients with corneas clear enough to permit them to read letters on the PAM chart, 17 (63%) had very accurately predicted visual acuities by this new method, compared to only eight patients (30%) with the PAM alone. Three patients had predicted visions better than final vision, but this was due to a concurrent cataract in two cases and chronic cystoid macular edema (CME) in the third case. This study indicates that temporarily placing a hard contact lens for use with the PAM can increase its accuracy in predicting final visual acuity after penetrating keratoplasty.

Original languageEnglish (US)
Pages (from-to)12-16
Number of pages5
JournalOphthalmology
Volume94
Issue number1
StatePublished - 1987

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Penetrating Keratoplasty
Contact Lenses
Visual Acuity
Corneal Transplantation
Macular Edema
Cornea
Cataract

ASJC Scopus subject areas

  • Ophthalmology

Cite this

Smiddy, W. E., Horowitz, T. H., Stark, W. J., Klein, P., Kracher, G. P., & Maumenee, A. E. (1987). Potential acuity meter for predicting postoperative visual acuity in penetrating keratoplasty. A new method using a hard contact lens. Ophthalmology, 94(1), 12-16.

Potential acuity meter for predicting postoperative visual acuity in penetrating keratoplasty. A new method using a hard contact lens. / Smiddy, W. E.; Horowitz, T. H.; Stark, W. J.; Klein, P.; Kracher, G. P.; Maumenee, A. E.

In: Ophthalmology, Vol. 94, No. 1, 1987, p. 12-16.

Research output: Contribution to journalArticle

Smiddy, WE, Horowitz, TH, Stark, WJ, Klein, P, Kracher, GP & Maumenee, AE 1987, 'Potential acuity meter for predicting postoperative visual acuity in penetrating keratoplasty. A new method using a hard contact lens', Ophthalmology, vol. 94, no. 1, pp. 12-16.
Smiddy, W. E. ; Horowitz, T. H. ; Stark, W. J. ; Klein, P. ; Kracher, G. P. ; Maumenee, A. E. / Potential acuity meter for predicting postoperative visual acuity in penetrating keratoplasty. A new method using a hard contact lens. In: Ophthalmology. 1987 ; Vol. 94, No. 1. pp. 12-16.
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