Relation between size at birth and age-related cataract

Area of Science:

• Ophthalmology
• Epidemiology
• Developmental Biology

Background:

• Size at birth is a marker of fetal growth and development.
• Age-related cataract is a leading cause of vision impairment.
• Understanding early life determinants of cataract is crucial for public health.

Purpose of the Study:

• To investigate the association between fetal growth, indicated by birth size, and the risk of developing age-related cataract.
• To explore potential links between birth weight and different subtypes of cataract.

Main Methods:

• A cohort of 741 individuals born in Sheffield (1922-1930) with available birth size data were recruited.
• 392 participants underwent ophthalmic examinations.
• Lens opacity was graded using the Lens Opacities Classification System (LOCS) III.

Main Results:

• No consistent association was found between birth size and overall age-related cataract risk after adjusting for confounders.
• A higher birth weight (>8 lb) was unexpectedly associated with an increased odds ratio for nuclear cataract (2.4; 95% CI 1.2-5.0).
• Risk of cortical cataract showed a non-significant trend of decreasing with increasing birth weight.

Conclusions:

• Birth size does not appear to be a consistent risk factor for age-related cataract.
• The observed increased risk of nuclear cataract with higher birth weight is contrary to expectations and may be a chance finding.
• Further research is needed to explore the divergent associations between birth weight and different cataract subtypes.