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Related Experiment Videos

Smoking and lens optical density.

B R Hammond1, B R Wooten, J E Náñez

  • 1Vision Science Laboratory, College of Arts and Sciences, Arizona State University West, Phoenix, USA.

Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)
|January 25, 2000
PubMed
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Smoking significantly increases lens optical density (OD), a precursor to age-related cataract, even in younger individuals. These effects persist after smoking cessation, indicating long-term ocular impact.

Area of Science:

  • Ophthalmology
  • Public Health
  • Toxicology

Background:

  • Smoking is a known risk factor for age-related cataract.
  • Limited data exists on smoking's impact on the lens before cataract formation.

Purpose of the Study:

  • To investigate the relationship between smoking behavior and lens optical density (OD) in individuals without clinical cataract.
  • To determine if smoking cessation affects lens OD.

Main Methods:

  • Compared lens OD in current smokers, never smokers, and past smokers using psychophysical methods.
  • Measured lens OD by comparing scotopic thresholds at 410 nm (measuring) and 550 nm (reference).
  • Assessed dose-response relationships between smoking frequency, years since cessation, and lens OD.

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Main Results:

  • Current smokers exhibited significantly higher lens OD compared to never smokers (p = 0.005).
  • A significant dose-response relationship was observed between smoking frequency and lens OD (p = 0.02).
  • Lens OD increases in smokers persisted even after smoking cessation, with no clear correlation to years since quitting.

Conclusions:

  • Smoking directly contributes to age-related increases in lens optical density throughout life.
  • Elevated lens OD due to smoking is a persistent change, remaining even after cessation.