"Eyes and Glasses" Common Optical Instruments PPT Courseware 2

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"Eyes and Glasses" Common Optical Instruments PPT Courseware 2

Eye

The structure of the eyeball

The cornea, pupil, lens and vitreous body in the eye work together to act as a "convex lens", and the retina acts as a "screen".

Eye adjustment

V is constant and u is large, the lens becomes flat and f becomes large.

V is constant and u is small, the lens becomes convex and f becomes small.

The normal visual distance is 25cm

Myopia

Causes of myopia

The lens is too thick (too convex, f is too small), the refractive power is too strong, and distant objects are imaged in front of the retina; the photopic distance of myopia is less than 25cm, and its far point and near point are shorter than normal people.

Correction of myopia

Myopia can be corrected by wearing glasses made with concave lenses

long sighted

Causes of hyperopia

The lens is too thin (too flat, f is too large), the refractive power is too weak, and the image of near objects is behind the retina; the photopic distance of hyperopia is greater than 25cm, and its near point and far point are longer than that of normal people.

Correction of hyperopia

Hyperopia can be corrected by wearing glasses made with convex lenses

Class exercise 1

1. The imaging principle of the eye is similar to that of _______. Its cornea, pupil, lens and vitreous body work together to act as ________, and objects are __________ images on its _______.

2. When the eyes change from looking at distant objects to looking at nearby objects, the object distance is ____, the ciliary muscle will cause the lens to change to _____, and the focal length will change to ____, so that the human eye can see the object clearly.

Class Exercise 2

3. Myopia can only see ____ objects clearly, but not ___ objects clearly; distant objects are imaged on the retina in myopia eyes ____; myopia glasses are _______.

4. Hyperopia can only see ____ objects clearly, but not ___ objects clearly; near objects are imaged on the retina in hyperopia eyes ____; hyperopia glasses are _______.

Class exercise 3

5. The clear vision distance of normal eyes is ______. Objects within this distance can be observed most clearly without eye fatigue.

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Update Time: 2024-11-18

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