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Questions and Answers
What is the definition of emmetropia?
What is ametropia?
What is focused on the retina in emmetropia?
What is included in ametropia?
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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.