Final answer:
A rupture of the superficial cortex at the suture lines often results in the formation of a cortical cataract. Parallel laser light is necessary for precise retinal repairs. A 16D spectacle lens is prescribed to compensate for the loss of focusing power after a lens is removed due to cataracts.
Step-by-step explanation:
Rupture of the superficial cortex at the suture lines may account for the appearance of a cortical cataract, which is an opacification of the lens fibers typically seen as wedge-shaped opacities or spoke-like shadows that point towards the center of the lens. The lens of the eye is crucial for focusing light onto the retina, and any opacities can lead to the scattering or dispersion of light, resulting in a loss of visual acuity.
When laser light is shone into a relaxed normal-vision eye to repair a tear, the rays entering the eye must be parallel to ensure accurate focusing on the retina. Parallel light rays are required to produce a precise and controlled burn needed for spot-welding on the retina during laser surgery.
If the lens of a person's eye is removed due to cataracts, the eye loses its ability to focus, hence a 16 diopter (D) spectacle lens is prescribed to compensate for the focusing power that the natural lens provided.