January 1994
Volume 35, Issue 1
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Articles  |   January 1994
Influence of type and severity of pure forms of age-related cataract on visual acuity and contrast sensitivity. Italian American Cataract Study Group.
Author Affiliations
  • G Maraini
    Istituto di Oftalmologia, Università di Parma, Italy.
  • F Rosmini
    Istituto di Oftalmologia, Università di Parma, Italy.
  • P Graziosi
    Istituto di Oftalmologia, Università di Parma, Italy.
  • M C Tomba
    Istituto di Oftalmologia, Università di Parma, Italy.
  • M Bonacini
    Istituto di Oftalmologia, Università di Parma, Italy.
  • R Cotichini
    Istituto di Oftalmologia, Università di Parma, Italy.
  • P Pasquini
    Istituto di Oftalmologia, Università di Parma, Italy.
  • R D Sperduto
    Istituto di Oftalmologia, Università di Parma, Italy.
Investigative Ophthalmology & Visual Science January 1994, Vol.35, 262-267. doi:
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    • Get Citation

      G Maraini, F Rosmini, P Graziosi, M C Tomba, M Bonacini, R Cotichini, P Pasquini, R D Sperduto; Influence of type and severity of pure forms of age-related cataract on visual acuity and contrast sensitivity. Italian American Cataract Study Group.. Invest. Ophthalmol. Vis. Sci. 1994;35(1):262-267.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

PURPOSE: To compare the relationship between logMAR visual acuity (VA) and cataract severity and between contrast sensitivity (CS) and cataract severity in pure types of age-related lens opacities. METHODS: Analysis included patients followed in the ongoing Italian-American Study of the Natural History of Age-Related Cataract. Lens opacities were classified and graded according to the Lens Opacities Classification System II (LOCS II). Visual acuity was measured with the Early Treatment Diabetic Retinopathy Study Chart. Contrast sensitivity was measured with the Pelli-Robson chart. RESULTS: Data from 1,076 eyes were used for the analysis (366 clear lenses; 550, 124, and 36 eyes with cortical, nuclear and posterior subcapsular cataract, respectively). In age-adjusted analyses, increasing severity of all three cataract types was associated with progressively higher logMAR VA, which translates into poorer acuity, and lower CS scores. For both VA and CS, the effect of increasing severity was greatest for nuclear and least for cortical opacities. After adjusting for age and VA, CS scores were no longer associated with cataract type and severity, with the exception of advanced cortical opacities. CONCLUSIONS: Increased cataract severity, as determined by LOCS II grading, is strongly associated with both VA and CS scores. Contrast sensitivity scores obtained from testing at low spatial frequency do not seem to offer additional information over standard VA testing in early cortical and posterior subcapsular opacities nor in nuclear cataracts.

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