Final answer:
The described condition is likely a Posterior subcapsular cataract, causing light to diffuse and requiring parallel rays for laser retina repairs. Hyperopia is due to insufficient lens power or a short eye, needing converging lenses, whereas myopia results from a too-powerful lens or long eye, corrected with diverging lenses.
Step-by-step explanation:
The eye condition described by 'stringy spokes seen on posterior peripheral lens' is likely a type of cataract. Specifically, this description best fits with a Posterior subcapsular cataract (D). This type of cataract is characterized by opacification at the back of the lens, which can appear as stringy or granular changes affecting vision. Cataracts cause cloudiness in the lens, leading to the diffusing or scattering of light, not necessarily dispersing it as in dispersion through a prism. When repairing a retina with laser treatment, the rays entering the eye must be parallel to ensure they focus precisely on the intended spot without scattering before hitting the retina.
Hyperopia, also known as farsightedness, occurs when images are focused behind the retina because the eye may be too short or the lens lacks sufficient power. In contrast, myopia or nearsightedness happens when images are focused in front of the retina, possibly due to an overly strong lens or an elongated eyeball. Corrective lenses, such as diverging lenses for myopia and converging lenses for hyperopia, can help to bring the image onto the retina, thereby improving the vision.