Figure 4From: Intrinsically photosensitive retinal ganglion cell function in relation to age: A pupillometric study in humans with special reference to the age-related optic properties of the lens The relation between age and lens transmission of blue light. Lens transmission correlated negatively to age, with lens transmission decreasing significantly with increasing age. The rate of change was approximately 1% per year of age (Pearson coefficient r = −0.91). Lens transmission of 1.0 corresponds to a totally clear lens in a young healthy subject (solid line is regression line, the dashed lines represent the 95% CI).Back to article page