What is the term used to describe the eye defect that causes difficulty to focus on close objects?
Refer to figure.
In the human eye, the image is finally focused on the retina where the photoreceptors convert it into nerve impulses that are then transferred the brain. Human eyes might have shape imperfections that cause the image to be focused in front or behind the retina, causing visual defects.
HYPERMETROPIA
Hypermetropia is also called hyperopia or long sightedness. It occurs when the human eye is shorter than normal and the image is focused behind the retina. The result is that distant objects may be seen clearly, but close objects appear blurry.
MYOPIA
Myopia is also called short sightedness. It occurs when the human eye is longer than normal and the image is focused in front of the retina. The result is that close objects are seen clearly, but distant objects appear blurry.
Hyperopia → close objects appear blurry
Presbycusis → gradual hearing loss due to age
Short sight → myopia
Myopia → distant objects appear blurry
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