Human eye and the colourful world

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Myopia

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33 Terms

1

Myopia

The eye defect where a person can see near by objects distinctly but cannot see the objects at a distance.

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2

Hypermetropia

The eye defect where a person can see distant objects Clearly but can't see nearby objects clearly.

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3

Presbyopia

This is an eye defect which happens with aging, in this eye defect a person can't see neither distant objects nor objects that are nearby.

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4

Lens in the eye

Convex or converging

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5

Corrective lens for myopic eye

Concave lens or diverging lens

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6

Corrective lens for hypermetropic eye

Convex lens or converging lens

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7

Cataract

The crystalline lens people at old age becomes milky and cloudy which causes partial or complete loss of vision.

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8

Cataract defect can be cured by

Cataract surgery

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9

Corrective lens for presbyopia is

Bi focal lens

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10

Lens forbi focal lenses

Upper portion is concave lens and lower portion is convex lens

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11

Length of diameter of the eyeball

2.3

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12

The lens system of human eye forms an Image on a light sensitive screen which is a delicate membrane having enormous number of light-sensitive cells called

Retina

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13

Light enters the eye throught a thin membrane called

Cornea

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14

Refraction of light rays entering the eye occurs at

The outer surface of the Cornea

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15

A dark muscular diaphragm that controls the size of pupil is called

Iris

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16

Which part of the eye regulates and controls the amount of light entering the eye

Pupil

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17

Near point for the normal eye

25 cm

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18

Farthest point for normal eye

Infinity

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19

The farthest point upto which the eye can objects Clearly is called

Far point of the eye

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20

The minimum distance at which objects can be seen most distinctly without strain is called

Near point of the eye

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21

When light is very bright

The iris contracts the pupil to allow less light to enter the eye

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22

When the light is dim

The iris expand the pupil to allow more light to enter the eye

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23

The ability of eye lens to adjust its focal length is called

power of accommodation

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24

When the Ciliary muscle are relaxed

The lens becomes thin,the curvatureof eye lens decreases and the focal length increases

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25

When the ciliary muscles contract

The lens becomes thick, the curvature of eye lens increases and the focal length decreases

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26

The cells in retina that respond to brightness or intensity of light

Rod shaped cell

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27

The cells in retina that respond to colour of light that enables us to distinguish between different colors

Cone shaped cells

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28

Reasons for myopic defect

  1. Increase in the length of eye ball/ distance of retina and eye ball Increases

  2. Decrease in the focal length in the eye lens when the eye is fully relaxed

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29

In myopia the image forms

Infront of retina

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30

In hypermetropia the image forms

Behind the retina

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31

Cause for hypermetropic defect

  1. Eye ball is too small

  2. the focal length of the eye lens is too long

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32

The eye lens forms which type of image

Real and inverted

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33

Function of vitreous humour

Maintain the shape of the eye ball

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