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20 questions
An image is formed on
Iris
Pupil
Retina
Cornea
Light enters the eye through a thin membrane called the
Iris
Pupil
Retina
Cornea
The shape of eye-ball is nearly _________________
Elliptical
Oval
Circular
Spherical
Following controls and regulates the amount of light entering the eye
Iris
Pupil
Retina
Corena
_________________ send signals to the brain
Optical nerve
Aqueous Humour
Viterous humour
Eye lens
When the light is very bright, the diameter of pupil
Expends
Contract
Remain same
All of these
When an object is placed closer to eye ____________
the ciliary muscles contract
curvature of the eye lens increases
Eye lens become thicker
All of the above
To see an object comfortably and distinctly, we must hold it about _______ cm from our eyes.
10
25
15
infinity
The ability of the eye lens to adjust its focal length is called
Accommodation
Accomplish
Composition
None of the above
The farthest point upto which the eye can see objects clearly is ____________ for a normal eye.
25 cm
15 cm
infinity
1 km
Following is far-sightedness
Myopia
Hypermetropia
Presbyopia
All of the above
The person who is suffering from the following disease cannot donate eyes.
diabetes
asthma
hypertension
tetanus
The person who is suffering from _____________ requires bi-focal lens.
(a) Hypermetropia
(b) Myopia
both option(a) and (b)
none of these
Following is true for Hypermetropia
It can be corrected by using a convex lens
It may arise when focal length of eye lens is too long
it may arise when eyeball has become too small
all of above
Having two eyes facilitates in
A: Increasing the field of view
B: Bringing three-dimensional view
C: Developing the concept of distance/size
Then the correct option is/are
A only
A and B only
B only
A,B and C
the black opening between the aqueous humour and the lens is called
retina
iris
cornea
pupil
The defect of vision in which the person is able to see distant object distinctly but cannot see nearby objects clearly is called
far-sightedness
near-sightedness
presbyopia
All of above
Myopia and Hypermetropia can be corrected by
Concave and plano-convex lens
Concave and convex lens
Convex and concave lens
Plano-concave lens for both defects.
The image formed on the retina of the human eye is
virtual and inverted
real and inverted
virtual and erect
real and erect
When the light rays enters the eye, most of the refraction occurs at the
crystalline lens
outer surface of cornea
iris
pupil
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