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Development of a Reading Accessibility Index Using the MNREAD Acuity Chart.

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A new Reading Accessibility Index (ACC) measures reading ability across print sizes. The ACC was lower in cataract patients compared to pseudophakia and control groups, indicating reduced reading access.

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Area of Science:

  • Ophthalmology
  • Vision Science
  • Human Factors

Background:

  • Reading accessibility is crucial for daily living.
  • Existing measures may not fully capture reading performance across various print sizes.
  • The Impact of Cataracts on Mobility (ICOM) study provides a relevant dataset for analysis.

Purpose of the Study:

  • To define and validate a novel Reading Accessibility Index (ACC).
  • To compare ACC scores between individuals with cataract, pseudophakia, and normal vision.
  • To assess the correlation of ACC with established visual function tests and daily living activities.

Main Methods:

  • Secondary data analysis of the ICOM study (1994-1996) involving 321 adults.
  • Participants included groups with cataract, pseudophakia, and natural crystalline lenses.
  • The ACC was calculated using mean reading speed across 10 largest print sizes on the MNREAD chart, normalized to normally sighted adults.

Main Results:

  • The ACC ranged from 0.19 to 1.33 among participants.
  • The cataract group exhibited significantly lower ACC (0.65 ± 0.18) than pseudophakia (0.77 ± 0.16) and control (0.76 ± 0.19) groups (P < .001).
  • ACC showed a stronger correlation with reading-related daily living activities (r = -0.60) than with visual acuity (r = -0.22) or contrast sensitivity (r = 0.20).

Conclusions:

  • The ACC is a valuable single-value measure of reading accessibility across everyday print sizes.
  • The ACC is sensitive to visual impairment, particularly in cataract patients.
  • ACC changes may effectively monitor outcomes of ophthalmic interventions and assistive technologies.