Human Eye
Conjunctive, ciliary body, aqueous, iris, cornea, pupil, lens, optic nerve, macula, retina, sclera, vitreous, etc. are the parts of human eye. This note has information about, the working principle of human eye and also the defects arise when the proper focus of light is not at the retina.
Summary
Conjunctive, ciliary body, aqueous, iris, cornea, pupil, lens, optic nerve, macula, retina, sclera, vitreous, etc. are the parts of human eye. This note has information about, the working principle of human eye and also the defects arise when the proper focus of light is not at the retina.
Things to Remember
- Conjunctive, ciliary body, aqueous, iris, cornea, pupil, lens, optic nerve, macula, retina, sclera, vitreous, etc. are the parts of human eye.
- Accommodation is defined as the ability of an eye to focus the distant objects as well as the nearby objects on the retina by changing the focal length of its lens.
- Far point of an eye is defined as the farthest point from the eye which can be seen clearly. The far point of human eye is at infinity.
- Near point of an eye is defined as the nearest point from the eye upto which eye can see objects clearly. The nearest point of normal human eye is 25cm from eye.
- Defects of vision of eye: Long sightedness (Hypermetropia) and Shortsightedness (Myopia).
- The causes of hypermetropia are increment of focal length, shortening of eye ball etc.
- The causes of myopia are decrement of focal length, elongation of eye ball etc.
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Human Eye
Accommodation:
Accommodation is defined as the ability of an eye to focus the distant objects as well as the nearby objects on the retina by changing the focal length of its lens.
Far point:
The far point of an eye is defined as the farthest point from the eye which can be seen clearly. The far point of human eye is at infinity.
Near point:
The near point of an eye is defined as the nearest point from the eye up to which eye can see objects clearly. The nearest point of normal human eye is 25 cm from eye.
Defects of vision of eye:
- Long sightedness (Hypermetropia)
Hypermetropia / long-sightedness is the defect of vision in which the eye cannot see the nearby objects clearly but can see the distant objects clearly.
Causes of Hypermetropia
- Shortening of theeye ball
- Increment of focal length
- Shortsightedness (Myopia)
Myopia is the defect of vision in which an eye cannot see the distant objects clearly but can see nearby objects clearly.
Causes of myopia
- Elongation of theeye ball.
- Decrement of focal length.
Lesson
Light
Subject
Science
Grade
Grade 10
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