10 Questions
Hyperopia is a condition in which you can see objects near to you clearly, but objects farther away are blurry.
True
Hyperopia occurs when visual images come to a focus behind the retina of the eye.
True
One of the causes of hyperopia is an abnormal shape of the cornea.
True
Hyperopia is caused by irregular shape of the cornea or lens of the eye.
True
Hyperopia can lead to blurry vision at all distances.
True
The main cause of hyperopia is a loss of elasticity of the lens of the eye.
False
The cornea contributes between 65-75 percent of the eye's total focusing power.
True
The iris and pupil control the amount of sound that enters the eye by opening and closing the pupil.
False
The lens is a transparent biconvex structure suspended behind the iris of the eye.
True
Emmetropia is a state of refraction where a point at an infinite distance from the eye is focused in front of the retina.
False
Study Notes
Hyperopia (Long-Sightedness)
- Definition: A condition where close objects are seen clearly, but distant objects appear blurry.
- Cause: Visual images focus behind the retina due to an irregular shape of the cornea or lens.
Eye Structure and Function
- Cornea: Contributes 65-75% of the eye's total focusing power; abnormal shape can cause hyperopia.
- Lens: A transparent, biconvex structure behind the iris; loss of elasticity leads to hyperopia.
- Iris and Pupil: Control the amount of light entering the eye by opening and closing the pupil.
Refraction and Vision
- Hyperopia: Can cause blurry vision at all distances.
- Emmetropia: A state of refraction where a point at an infinite distance is focused in front of the retina.
Learn about different types of ametropia including myopia, hyperopia, astigmatism, and presbyopia. Explore how these conditions affect vision and how they are related to the focusing of light on the retina.
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