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Questions and Answers
What is the definition of emmetropia?
What is the definition of emmetropia?
- A state of refraction where parallel rays of light are focused in front of the retina.
- A state of refraction where parallel rays of light are focused on the retina with accommodation at rest. (correct)
- A state of refraction where parallel rays of light are focused behind the retina.
- A condition of refractive error.
What is ametropia?
What is ametropia?
- A condition of accommodation.
- A state of refraction with normal vision.
- A state of refraction with no error.
- A state of refraction with refractive error. (correct)
What is focused on the retina in emmetropia?
What is focused on the retina in emmetropia?
- Convergent rays of light.
- Divergent rays of light.
- Parallel rays of light from infinity. (correct)
- Parallel rays of light from a near distance.
What is included in ametropia?
What is included in ametropia?
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What is the state of accommodation in emmetropia?
What is the state of accommodation in emmetropia?
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Study Notes
Refractive States
- Emmetropia: a state of refraction where parallel rays of light from infinity are focused on the retina with the accommodation at rest.
- Ametropia: a state of refraction where parallel rays of light from infinity are not focused on the retina, either in front of or behind it, in one or both meridians.
Types of Ametropia
- Myopia
- Hypermetropia
- Astigmatism
Related Conditions
- Aphakia
- Pseudophakia
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Description
Emmetropia is an optically normal eye that refracts parallel rays of light onto the retina. Ametropia is a refractive error with light focused in front of or behind the retina.
