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Related Experiment Videos

Night myopia: implications for the young driver.

T P Fejer1, R Girgis

  • 1Division of Ophthalmology, Women's College Hospital, Toronto.

Canadian Journal of Ophthalmology. Journal Canadien D'Ophtalmologie
|June 1, 1992
PubMed
Summary
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Night myopia, an increase in nearsightedness in low light, affects 17% of adults. Younger individuals (16-25) show higher prevalence, suggesting potential driving difficulties without correction.

Area of Science:

  • Ophthalmology
  • Optometry
  • Vision Science

Background:

  • Night myopia is a common phenomenon impacting visual acuity in low-light conditions.
  • Understanding its prevalence and severity is crucial for public safety, especially for activities like driving.

Purpose of the Study:

  • To investigate the prevalence and degree of night myopia in a diverse age group.
  • To assess the potential visual challenges posed by night myopia during nighttime activities.

Main Methods:

  • 380 patients (16-80 years) without eye disease were tested for night myopia using a laser speckle generator under photopic and scotopic conditions.
  • Night myopia was defined as an increase of ≥0.75 diopters from photopic to scotopic states, correlating to visual acuity of 20/45 or less.

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Main Results:

  • Overall, 17% of participants exhibited night myopia.
  • In the younger cohort (16-25 years), 38% had ≥0.75 D of night myopia, with 4% experiencing ≥2.50 D (20/265 acuity).

Conclusions:

  • Night myopia is prevalent and can significantly impair vision in certain individuals, particularly younger ones.
  • Corrective lenses for night myopia could mitigate visual difficulties experienced while driving in the dark.