Unit 10 · Effects of injuries to the cornea in the eyesAccommodation of Eye
Words of This Topic
- Object distance: the distance of the object from the eye.
- Image distance: the distance between the eye lens and the retina, which stays the same in the eye.
- Curvature: how strongly the surface of the lens is curved. More curvature means a thicker lens.
- Focal length: the distance from the lens to its focus. A thicker lens has a shorter focal length.
- Ciliary muscles: the muscles around the lens that change its thickness by relaxing and contracting.
- Suspensory ligaments: the fine fibres that join the ciliary muscles to the lens.
- Accommodation of the eye: adjusting the focal length of the eye lens to the distance of the object, through the ciliary muscles.
- Far point: the farthest distance at which the eye sees clearly. Infinity for a normal eye.
- Near point: the nearest distance at which the eye sees clearly. 25 cm for a normal eye.
- Least distance of distinct vision: another name for the distance of the near point, 25 cm for a normal eye.
- Range of vision: the distance from the near point to the far point, 25 cm to infinity for a normal eye.
- Infinity (∞): so far away that the rays from the object reach the eye parallel.