The boy wears glasses with diffusing lenses. What is his visual defect?
| September 23, 2021 | education
The human eye (normally) focuses the rays from distant objects with the help of the cornea and the lens exactly on the retina without tension. Deviations occur – either the eye has an elongated shape, or its refractive power is abnormally high. In both cases, the image is not formed on the retina, but in front of it. Objects located far away are poorly visible, but close ones are well. This abnormality is called myopia.
Diffusing lenses increase the focal length of the lens-lens system so that the image of distant objects is built on the retina.
Answer: The boy has myopia.
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