Diet and cataract: the Blue Mountains Eye Study

Area of Science:

• Ophthalmology
• Nutritional Science
• Gerontology

Background:

• Cataracts are a leading cause of vision impairment in older adults.
• Nutritional factors are increasingly recognized for their role in age-related eye diseases.
• Understanding the link between diet and cataract subtypes is crucial for preventative strategies.

Purpose of the Study:

• To examine the association between various macro- and micronutrients, including antioxidant vitamins, and the three primary types of cataracts (cortical, nuclear, posterior subcapsular).
• To investigate potential protective effects of specific nutrients against cataract development in an aging population.

Main Methods:

• A population-based, cross-sectional study involving 2,900 participants aged 49-97 years.
• Dietary intake assessed using food frequency questionnaires.
• Cataract presence and severity evaluated through lens photography, graded for cortical, nuclear, and posterior subcapsular types.

Main Results:

• Higher intakes of protein, vitamin A, niacin, thiamin, and riboflavin were significantly associated with a reduced prevalence of nuclear cataract.
• Adjusted odds ratios indicated a protective effect for these nutrients, with the highest intake quintiles showing substantially lower odds compared to the lowest.
• Intake of polyunsaturated fats showed an association with reduced cortical cataract prevalence; no nutrient associations were found for posterior subcapsular cataract.

Conclusions:

• The lens nucleus appears particularly susceptible to nutritional deficiencies.
• Protein, vitamin A, niacin, thiamin, and riboflavin demonstrated a protective effect against nuclear cataract in this study population.
• Dietary patterns rich in these specific nutrients may contribute to preventing nuclear cataract formation.