A condition that develops from an irregular shape of the cornea or the lens, which makes it impossible for the lens to accommodate a fully focused image, is known as ______.

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Let's break down each option in light of the description: a condition arising from an irregular shape of the cornea or lens that prevents the lens from forming a fully focused image.

Option a: retinitis pigmentosa. This is a degenerative retinal disease affecting photoreceptor cells, leading to peripheral vision loss and night blindness. It is not caused by corneal or lens shape, nor does it primarily affect focusing.

Option b: macular degeneration. This condition targets the macula, the central part of the retina, and leads to central vision loss. It is unrelated to corneal or lens shape or accommodation problems.

Option c: presbyopia. Presbyopia is the age-related loss of the eye's ability to accommodate for near tasks due to stiffening of the lens. While it affects focusing, it is not described as arising from an irregular corneal or lens shape.

Option d: astigmatism. Astigmatism results from an irregular curvature of the cornea or, less commonly, the lens, causing multiple focal points and blurred or distorted vision because a fully focused image cannot be formed. This aligns with the given description about irregular shape causing improper accommodation of a focused image.

In summary, the description points to an optical shape irregularity at the cornea or lens leading to imperfect focus, which is characteristic of astigmatism rather than the other listed conditions.

PSYC 230 A SP25 Unit 8 Lecture: The Eye

A condition that develops from an irregular shape of the cornea or the lens, which makes it impossible for the lens to accommodate a fully focused image, is known as ______.

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