Lens densitometry increases significantly with age in a zone-dependent pattern, with the central 0-2 mm zone and mid-peripheral annuli showing the greatest optical changes, while the posterior cortical region remains relatively stable.
Key Findings
Results
Global lens density increased progressively with age across healthy adults.
272 eyes from 272 healthy adults aged 18-80 years (mean ± SD, 40.96 ± 15.13 years; 36.0% male) were analyzed using Pentacam HR Scheimpflug imaging.
Global density rose from 7.87 ± 0.26 in the 18-39 age group to 8.58 ± 0.60 in the 40-59 age group and 9.67 ± 0.45 in the 60-80 age group (p < 0.001).
Densitometry values were measured on a scale of 0 (clear) to 100 (opaque).
In univariable regression, age was strongly associated with global density (β = 0.041/year, R² = 0.648, p < 0.001).
Results
The central 0-2 mm zone showed the steepest age-related increase in lens density among all zones.
Central 0-2 mm zone density increased from 7.96 ± 0.31 (ages 18-39) to 10.08 ± 0.92 (ages 60-80; p < 0.001).
This represented the largest absolute change across all measured zones.
In univariable regression, age was associated with central 0-2 mm zone density at β = 0.049/year, R² = 0.635, p < 0.001.
Results
Both mid-peripheral annular zones (2-4 mm and 4-6 mm) showed significant age-related increases in lens density.
The 2-4 mm annulus density increased from 7.89 ± 0.28 to 9.76 ± 0.59 across age groups (p < 0.001).
The 4-6 mm annulus density increased from 7.87 ± 0.25 to 9.68 ± 0.46 across age groups (p < 0.001).
In univariable regression, β = 0.043/year for both annuli, with R² values of 0.584-0.724 (both p < 0.001).
Results
The posterior cortical region of the lens did not show significant age-related changes in density.
Posterior cortical region density did not differ significantly by age group (p = 0.724).
This finding contrasts markedly with the significant age-related increases observed in all other lens zones.
The study identified the posterior cortical region as relatively stable compared to the central and mid-peripheral zones.
Methods
Zone-specific normative densitometry values were established for healthy adults using Scheimpflug imaging across multiple lens regions.
The study analyzed densitometry across the central 0-2 mm zone, anterior and posterior cortical regions, and the 2-4 mm and 4-6 mm annuli.
This was a cross-sectional study design including 272 healthy adults spanning a broad age range of 18-80 years.
Univariable and multivariable linear regression analyses were performed to evaluate demographic and ocular biometric associations with densitometry values.
What This Means
This research measured the clarity of the human lens in 272 healthy adults between ages 18 and 80 using a specialized camera called a Scheimpflug device (Pentacam HR). The lens was divided into different zones — the central area, two ring-shaped middle zones, and the front and back outer layers — and the cloudiness (densitometry) of each zone was measured on a scale from 0 (perfectly clear) to 100 (completely opaque). The researchers found that the lens naturally becomes less transparent as people age, but this change is not uniform across all parts of the lens.
The central zone of the lens showed the most dramatic increase in cloudiness with age, rising from an average of about 7.96 in young adults (ages 18-39) to over 10 in older adults (ages 60-80). The two ring-shaped middle zones also showed significant increases with age, while the back outer layer (posterior cortex) of the lens remained remarkably stable across all age groups. Age was the strongest predictor of lens cloudiness, explaining up to 72% of the variation in some zones.
This research suggests that clinicians and researchers now have zone-specific reference values for what a 'normal' aging lens looks like, which could help distinguish natural age-related lens changes from early cataract formation. Understanding which parts of the lens change most with age may also help improve how cataracts are detected, monitored, and treated, as well as how outcomes of procedures like cataract surgery or refractive lens exchange are evaluated.
Ucgul R, Tekin K, Saygili E, Teberik K, Ozdemir S. (2026). Mapping normal lens transparency in adulthood: zone-specific densitometry trends.. International ophthalmology. https://doi.org/10.1007/s10792-026-04224-2