Brightness acuity test and outdoor visual acuity in cataract patients

Jack T. Holladay, Thomas Prager, Jorge Trujillo, Richard S. Ruiz

Research output: Contribution to journalArticlepeer-review

87 Scopus citations


The disparity between functional outdoor vision and the acuity measured in the standard refracting lane is well known among clinicians. A simple device, the brightness acuity tester (B.A.T.), was developed to predict a patient's functional outdoor acuity. The B.A.T. has an illuminated hemispheric bowl, 60 mm in diameter, with a 12-mm aperture. Fourteen normals and 50 patients with cataracts were tested using the B.A.T. and then tested outside in bright sunlight. The B.A.T. correlated extremely well (r = +0.84, P <.0001) with the acuities measured outside. There was no decrease in visual acuity in the 14 normal patients,but there was a one to ten line decrease in vision among the cataract patients. Upon retesting, the B.A.T. scores did not vary, while outside testing scores did change due to variable outdoor ambient light levels on sunny days. The B.A.T. is a simple, repeatable, useful test for predicting functional outdoor acuity.

Original languageEnglish (US)
Pages (from-to)67-69
Number of pages3
JournalJournal of Cataract and Refractive Surgery
Issue number1
StatePublished - 1987


  • brightness acuity tester
  • cataract
  • functional outdoor acuity
  • visual acuity

ASJC Scopus subject areas

  • Surgery
  • Ophthalmology
  • Sensory Systems


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