Multiple choice Questions on the Eye:
Which of the following lens is used to minimize hypermetropia?
(a) Convex tens
(b) Concave lens
(c) Cylindrical lens
(d) None of these
Where in the eye do cataracts occur?
(a) Iris
(b) Cornea
(c) Retina
(d) Lens
The amount of light entering into the eye is controlled by:
(a) iris
(b) pupil
(c) cornea
(d) optic nerves
The dark muscular diaphragm that controls the size of the pupil is known as _____
(a) cornea
(b) ciliary muscles
(c) iris
(d) crystalline lens
The one associated with accommodation in the eyes of man is
(a) ciliary muscles
(b) Depressor bulbi
(c) Levator bulbi
(d) All of these
A person uses spectacles of power +2D. He is suffering from
(a) Short-sightedness or myopia
(b) Long-sightedness or hypermetropia
(c) Presbyopia
(d) Astigmatism
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In the human eye, which part of the eye receives the optical image of the object and then converts it into electrical pulses ?
(a) Cornea
(b) Sclerotic
(c) Retina
(d) None of these
The light that enters the human eye experiences most of the refraction while passing through
(a) Cornea
(b) Aqueous humor
(c) Vitrous humor
(d) Crystalline lens
Retina is most sensitive at
(a) Optic disc
(b) Periphery
(c) Macula lutea
(d) Fovea centralis
Eyes are most sensitive to green color with wave length of
(a) 1000A°
(b) 2500A°
(c) 5000A°
(d) statement incorrect
Eye defect due to aging is called
(a) Myopia
(b) Nypermetropia
(c) Presbyopia
(d) Astigmatism
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The defect of vision in which a person can see distant objects clearly but nearby objects look blurred is :
(a) Myopia
(b) Astigmatism
(c) Hypermetropia
(d) Presbyopia
The human eye forms the image of an object at its :
(a) lris
(b) Cornea
(c) Retina
(d) Pupil
The hyper-metropia is a
(a) Short-side defect
(b) Long- side defect
(c) Bad vision due to old age
(d) None of these
If the light source in front of an eye becomes bright, suddenly
(a) Focus of lens will change
(b) Retina is bleached
(c) Vitreous humor is decondensed
(d) Pupil will contract
A person cannot see objects clearly which are nearer than 75 cms from his eyes. What disease is he suffering from?
(a) Astigmatism
(b) Colour-blindness
(c) Myopia
(d) Hypermetropia
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The human eye has lens of
(a) Fixed focal length
(b) Variable focal length
(c) Variable refractive index
(d) Glass
A human eye can focus on objects at different distances by adjusting the focal length of the eye lens. This is due to :
(a) Far-Sightedness
(b) Near-sightedness
(c) Accommodation
(d) Persistence of vision
Color blindness is also known as
(a) Trachoma
(b) Astigmatism
(c) Daltonism
(d) Myopia
The iris takes its name from the Greek word meaning what?
(a) Delicate
(b) Opening
(c) Rainbow
(d) Blue
How should people wearing spectacles work with a microscope?
(a) They cannot use the microscope at all
(b) They should keep on wearing their spectacles
(c) They should take off their spectacles
(d) (b) and (c) are both ways
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If the distance from the far point for a of myopic patient is doubled, the focal length of the lens required to cure it will become
(a) Half
(b) Double
(c) The same but a convex lens
(d) The same but a concave lens
Which is the main part of the human eye that causes maximum refraction of light?
(a) Lens
(b) Conjunctiva
(c) Cornea
(d) Aqueous humor
Which of the following helps the eye to adjust the focal length of the eye lens :
(a) Cornea
(b) Conjunctiva
(c) Ciliary body
(d) Iris
A person is suffering from the defect astigmatism. Its main reason is
(a) Distance of the eye lens from the retina is increased
(b) Distance of the eye lens from the retina is decreased
(c) The cornea is not spherical
(d) Power of accommodation of the eye is decreased
Which part of the brain is involved in the contraction of pupils in response to bright light ?
(a) Inferior colliculus
(b) Superior colliculus
(c) Hypothalamus
(d) Thalamus
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When the power of the eye lens increases, the defect of vision is produced. The defect is known as
(a) Shortsightedness
(b) Longsightedness
(c) Colorblindness
(d) None of the above
Presbyopia is an eye defect in which
(a) The eye ball becomes short
(b) The lens becomes opaque
(c) Loss in elasticity of lens occurs
(d) Loss of contractility of ciliary muscle occurs
The image formed on the retina of a human eye is
(a) Real and upright
(b) Real and inverted
(c) Imaginary and upright
(d) Imaginary and inverted
Select the correct regarding hyperopia
(a) An image of the object is formed between lens and retina due to the shorter anteroposterior axis of the eye ball.
(b) The image of the object is formed behind the retina due to the longer anteroposterior axis of the eye ball.
(c) Images are formed behind the retina owing to the shorter anteroposterior axis of the eye ball.
(d) An image is formed in front of the retina owing to the longer anteroposterior axis of the eye ball.
The circular part in the center of the retina is called
(a) Blind spot
(b) Yellow spot
(c) Red spot
(d) None of the above
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In a color blind person, the condition of protanopia arises when the
(a) Red cones are absent and the red color is not perceptible
(b)Â Green cones are absent and the green objects appears red
(c) Red cones are absent red object appears green
(d) Cones cells lack any kind of color pigments.
If there had been one eye of the man, then
(a) Image of the object would have been inverted
(b) Visible region would have decreased
(c) Image would have not been seen three dimensional
(d) (b) and (c) both
The accommodation of a normal eye is from :
(a) 0 to 25 cm
(b) Zero to infinite
(c) 25 cm infinity
(d) None of these
__ is a serious condition that can lead to blindness.
(a) Somatic mutation
(b) Heart disease
(c) Glaucoma
(d) Osteoporosis
Which of the following parts of the eye are the most color sensitive?
(a) the rods
(b) the cones
(c) the iris
(d) the retina
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A defective eye cannot see closed objects clearly because their image is formed
(a) On the eye lens
(b) Between eye lens and retina
(c) On the retina
(d) Beyond retina
In the human eye the focussing is done by
(a) To and fro movement of the eye lens
(b) To and fro movement of the retina
(c) Change in the convexity of the lens surface
(d) Change in the refractive index of the eye fluids
The human eye has a lens which has a
(a) Soft portion at its center
(b) Hard surface
(c) Varying refractive index
(d) Constant refractive index
Myopia is due to
(a) Elongation of eye ball
(b) Irregular change in focal length
(c) Shortening of eyeballs
(d) Older age
A man is suffering from color blindness for green color. To remove this defect, he should use goggles of
(a) Green colored glasses
(b) Red colored glasses
(c) Smoky colored glasses
(d) None of the above
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the Retina of the eye acts like __ of a camera
(a) Shutter
(b) Film
(c) Lens
(d) None of these
The ability of the eye to see objects at all distances is called
(a) Binocular vision
(b) Myopia
(c) Hypermetropia
(d) Accommodation
The sensation of vision in the retina is carried to the brain by
(a) Ciliary muscles
(b) Blind spot
(c) Cylindrical lens
(d) Optic nerve
Image is formed for the short sighted person at
(a) Retina
(b) Before retina
(c) Behind the retina
(d) Image is not formed at all
