Refraction and the Eye

The Correct Answer is D

Eyes that do not require corrective lenses or refractive surgery to achieve good quality of vision are considered to have a normal ‘neutral’ refractive state that we call emmetropia. Although emmetropic eyes require no refractive correction, subtle refractive errors and aberrations are still present that are significant for the quality of vision. Equally important to the presbyopic patient are the subtle refractive errors and aberrations experienced during accommodation.


Myope:

- The eye at rest has a dioptre power that is too strong and/or the eye is longer than the non-
accommodated focal length of the refractive elements (cornea + lens). The light rays from distance focus within the eye and not on the macula.
- A near sighted person is helped with minus lenses.

Symptoms: Does not see well at distance but sees well near objects.

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