A retired astronomer notices that when looking at bright stars at night, the stars no longer appear as sharp points of light but instead look dim and are surrounded by a wide, fuzzy halo.
An optometrist diagnoses them with a cataract.
Figure 1 shows a simulation of how a single point source of light is perceived by a healthy eye compared to an eye with a cataract.
Describe the physiological changes in the eye that cause a person with a cataract to perceive the point of light as blurry and dim, as shown in Figure 1.
