If poor vision is simply due to refractive error, the acuity should improve with use of a(n):

Prepare for the JCAT Independent Practice Exam! Study with flashcards and multiple choice questions, each with hints and explanations. Get ready for your exam!

The correct answer is the pinhole disc, which is used to determine if a person's poor vision is due to a refractive error. When a person looks through a pinhole, the aperture restricts the rays of light entering the eye, resulting in a smaller, more focused entry point. This reduces the impact of refractive errors by allowing only the central rays of light to reach the retina, which helps improve visual acuity. If the vision improves significantly when looking through the pinhole, it indicates that the issue is indeed related to refractive error, such as myopia or hyperopia, rather than something more serious like cataracts or retinal disease.

Other options, while relevant in certain contexts, do not specifically address improving vision due to refractive errors. A Placido disc is used primarily for evaluating corneal shape and detecting conditions like keratoconus. Placing an occluder over the non-dominant or dominant eye can be helpful in assessing binocular vision or different aspects of visual acuity, but it does not specifically improve or clarify vision related to refractive errors.

Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy