Notes : Human Eye & Colourful World Class 10 Notes | EduRev

Class 10 : Notes : Human Eye & Colourful World Class 10 Notes | EduRev

 Page 1


Human Eye 
? A human eyeball is like a simple camera! 
? Sclera: outer walls, hard, like a light-tight box. 
? Cornea and crystalline lens (eyelens): the two 
lens system. 
? Retina: at the back of eyeball, like the film. 
? Iris: like diaphragms or stop in a camera. 
? Pupil: camera aperture.  
? Eyelid: lens cover. 
Page 2


Human Eye 
? A human eyeball is like a simple camera! 
? Sclera: outer walls, hard, like a light-tight box. 
? Cornea and crystalline lens (eyelens): the two 
lens system. 
? Retina: at the back of eyeball, like the film. 
? Iris: like diaphragms or stop in a camera. 
? Pupil: camera aperture.  
? Eyelid: lens cover. 
 
Sclera (The white/non-transparent tissue surrounding the cornea)  
 
Page 3


Human Eye 
? A human eyeball is like a simple camera! 
? Sclera: outer walls, hard, like a light-tight box. 
? Cornea and crystalline lens (eyelens): the two 
lens system. 
? Retina: at the back of eyeball, like the film. 
? Iris: like diaphragms or stop in a camera. 
? Pupil: camera aperture.  
? Eyelid: lens cover. 
 
Sclera (The white/non-transparent tissue surrounding the cornea)  
 
Aqueous humor and Vitreous humor  
? The Aqueous Humor is the clear liquid between the 
cornea and the lens. It has the benefit of being fairly 
homogenous and, as a result, the optical properties 
are easily measured. (Le Grand, 1967)  
? The space that it inhabits is called the anterior 
chamber.  
? The Vitreous Humor is the clear liquid between the 
lens and the retina.  
? The space that it fills is called the vitreous body.  
Page 4


Human Eye 
? A human eyeball is like a simple camera! 
? Sclera: outer walls, hard, like a light-tight box. 
? Cornea and crystalline lens (eyelens): the two 
lens system. 
? Retina: at the back of eyeball, like the film. 
? Iris: like diaphragms or stop in a camera. 
? Pupil: camera aperture.  
? Eyelid: lens cover. 
 
Sclera (The white/non-transparent tissue surrounding the cornea)  
 
Aqueous humor and Vitreous humor  
? The Aqueous Humor is the clear liquid between the 
cornea and the lens. It has the benefit of being fairly 
homogenous and, as a result, the optical properties 
are easily measured. (Le Grand, 1967)  
? The space that it inhabits is called the anterior 
chamber.  
? The Vitreous Humor is the clear liquid between the 
lens and the retina.  
? The space that it fills is called the vitreous body.  
Functions? 
 
? Provides nourishment to the eyelens and cornea.  
    Cannot use the blood vessels: 
? Will block the light. 
? Easy for surgical transplant.  
? Hold the shape of the eyeball.  
 
 
Page 5


Human Eye 
? A human eyeball is like a simple camera! 
? Sclera: outer walls, hard, like a light-tight box. 
? Cornea and crystalline lens (eyelens): the two 
lens system. 
? Retina: at the back of eyeball, like the film. 
? Iris: like diaphragms or stop in a camera. 
? Pupil: camera aperture.  
? Eyelid: lens cover. 
 
Sclera (The white/non-transparent tissue surrounding the cornea)  
 
Aqueous humor and Vitreous humor  
? The Aqueous Humor is the clear liquid between the 
cornea and the lens. It has the benefit of being fairly 
homogenous and, as a result, the optical properties 
are easily measured. (Le Grand, 1967)  
? The space that it inhabits is called the anterior 
chamber.  
? The Vitreous Humor is the clear liquid between the 
lens and the retina.  
? The space that it fills is called the vitreous body.  
Functions? 
 
? Provides nourishment to the eyelens and cornea.  
    Cannot use the blood vessels: 
? Will block the light. 
? Easy for surgical transplant.  
? Hold the shape of the eyeball.  
 
 
Focusing  
? The cornea and eyelens form a compound lens 
system, producing a real inverted image on the 
retina. 
? From air to cornea (n=1.376): large bending, the main 
focusing. 
? From cornea to eyelens (n=1.406), less focusing power. 
(Eyelens can develop white cloudiness when getting old: 
Cataracts.) 
? The eye has a limited depth of field. We cannot see 
things close and far at the same time. 
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