Write the different parts of a human eye starting from the inner part to the outermost part.
Answers to be written as per CBSE class 8.
Expecting accurate answer.
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sclera,cornea,iris,pupil, retina, eyelids,eyelens
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Sclera
The sclera is the white of the eye. "Don't shoot until you see their scleras."
Exterior is smooth and whiteInterior is brown and groovedExtremely durableFlexibility adds strengthContinuous with sheath of optic nerveTendons attached to it
The Cornea
The cornea is the clear bulging surface in front of the eye. It is the main refractive surface of the eye.
Primary refractive surface of the eyeIndex of refraction: n = 1.37Normally transparent and uniformly thickNearly avascularRichly supplied with nerve fibersSensitive to foreign bodies, cold air, chemical irritationNutrition from aqueous humor andTears maintain oxygen exchange and water contentTears prevent scattering and improve optical quality
Anterior & Posterior Chambers
The anterior chamber is between the cornea and the irisThe posterior chamber is between the iris and the lensContains the aqueous humorIndex of refraction: n = 1.33Specific viscosity of the aqueous just over 1.0 (like water, hence the name)Pressure of 15-18 mm of mercury maintains shape of eye and spacing of the elementsAqueous humor generated from blood plasmaRenewal requires about an hourGlaucoma is a result of the increased fluid pressure in the eye due to the reduction or blockage of aqueous from the anterior to posterior chambers.
Iris/Pupil
Iris is heavily pigmentedSphincter muscle to constrict or dilate the pupilPupil is the hole through which light passesPupil diameter ranges from about 3-7 mmArea of 7-38 square mm
The sclera is the white of the eye. "Don't shoot until you see their scleras."
Exterior is smooth and whiteInterior is brown and groovedExtremely durableFlexibility adds strengthContinuous with sheath of optic nerveTendons attached to it
The Cornea
The cornea is the clear bulging surface in front of the eye. It is the main refractive surface of the eye.
Primary refractive surface of the eyeIndex of refraction: n = 1.37Normally transparent and uniformly thickNearly avascularRichly supplied with nerve fibersSensitive to foreign bodies, cold air, chemical irritationNutrition from aqueous humor andTears maintain oxygen exchange and water contentTears prevent scattering and improve optical quality
Anterior & Posterior Chambers
The anterior chamber is between the cornea and the irisThe posterior chamber is between the iris and the lensContains the aqueous humorIndex of refraction: n = 1.33Specific viscosity of the aqueous just over 1.0 (like water, hence the name)Pressure of 15-18 mm of mercury maintains shape of eye and spacing of the elementsAqueous humor generated from blood plasmaRenewal requires about an hourGlaucoma is a result of the increased fluid pressure in the eye due to the reduction or blockage of aqueous from the anterior to posterior chambers.
Iris/Pupil
Iris is heavily pigmentedSphincter muscle to constrict or dilate the pupilPupil is the hole through which light passesPupil diameter ranges from about 3-7 mmArea of 7-38 square mm
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