Human lens weights with increasing age.

Area of Science:

• Ophthalmology
• Human Anatomy
• Biometry

Background:

• The human lens undergoes continuous changes throughout life.
• Understanding age-related changes in lens weight is crucial for ophthalmological research.

Purpose of the Study:

• To evaluate age-related changes in human lens wet and dry weights.
• To establish a biphasic growth model for human lenses.

Main Methods:

• Human lenses (n=549) were extracted from donor eyes.
• Wet and dry weights were measured after controlled drying at 80°C.
• Data were analyzed using logistic and linear equations to model growth.

Main Results:

• Lens weight increase follows a biphasic pattern, with logistic growth before age 2 and linear growth thereafter.
• Male lenses achieve greater asymptotic wet (6.0 mg) and dry (1.77 mg) weights than female lenses.
• Postnatal weight accrual rates are similar for both sexes after age 3.

Conclusions:

• The biphasic growth model accurately describes human lens weight changes.
• Significant sexual dimorphism exists in lens size, with males having larger lenses.
• Lens weight increases continuously, influenced by both prenatal and postnatal growth factors.