Biology · Physics

Vision Defects and Eye Conditions

1,088 Questions

Vision defects and eye conditions questions focus on common visual impairments like myopia, cataracts, and glaucoma. These topics are regularly tested in the general science sections of competitive exams. Solve these questions to learn about optical defects and treatments.

Myopia and hypermetropiaCataracts and risk factorsGlaucoma treatmentsEye infection typesArtificial tears

Vision Defects and Eye Conditions Questions

Multiple choice evs we are special defects of eye disorders of nervous system braille script

Which of the following is caused due to the formation of an opaque membrane once the eye lens?

  1. Presbyopia

  2. Astigmatism

  3. Cataract

  4. Myopia
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Cataract is a problem of an eye. It arises in old age it is caused due to the formation od an opaque membrane over the eyeless. This member reduces the intensity of light falling or the eye lens. Cataract is corrected by surgical replacement of lens with the artificial lens. 

Multiple choice evs we are special defects of eye disorders of nervous system braille script

Conjunctivitis is 

  1. The number of conjunctions in the english grammar

  2. The conjunction between ball and socket arrangement of human bones

  3. A common infection that affects our eyes

  4. A virus which attacks conjunctiva in the eyes
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Conjunctivitis is an infection of the eyes. In this the conjunctiva which is the thin skin present on the front of the eye becomes swollen. It may affect one or both eyes. The eyes become red and sticky or watery that causes eye surface irritation. So, the correct answer is option C.

Multiple choice evs we are special defects of eye disorders of nervous system braille script

Which of the following occurs in persons suffering from myopia?

  1. The eye ball is shortened

  2. Ciliary muscles contract

  3. The eye ball elongates

  4. The retina expands
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The shape of the lens of the eye is regulated by the suspensory ligaments and ciliary body. The focal length is adjusted by their regular contraction and relaxation. Myopia is a condition of the eye where light focuses in front, instead of on the retina. This causes distant objects to be blurry while close objects appear normal. Myopia is corrected by using a concave lens. This defect arises either by elongation of the eyeball of the excessive curvature of the cornea. In this far point of the suffering myopia cornea close to the eye.

Thus, the correct answer is option C.

Multiple choice evs we are special defects of eye disorders of nervous system braille script

In the following abnormalities of the eye, which one is a serious condition that leads to blindness?

  1. Presbyopia

  2. Myopia

  3. Hypermetropia

  4. Glaucoma
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Loss of flexibility in crystalline lens with age causes presbyopia which includes focusing on the image behind the retina. Both hypermetropia and presbyopia cause the formation of blurry nearby images which can be corrected by wearing of the convex lens. Myopia is caused by elongation of the eyeball which results in focusing of the image in front of retina and forms blurry distant images. Myopia is corrected using the concave lens. Glaucoma is caused by blockage of tiny ducts that drain the excess aqueous humor from anterior compartment causing a buildup of aqueous humor. This causes compression of the arteries that serve the nerve fibers of the retina due to increased pressure. The death of nerve fibers due to lack of nutrients makes the person partially blind. Thus, the correct answer is option D.

Multiple choice evs we are special defects of eye disorders of nervous system braille script

The defect of eye develops in the old age because

  1. Lens becomes opaque

  2. Eye ball becomes small

  3. Eye ball becomes long

  4. Lens looses its elasticity
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Presbyopia is the defect of old age in which both the near and distant objects are blurred The elasticity of lens of eye decreases hence the accommodation power diminishes.

Multiple choice evs we are special defects of eye disorders of nervous system braille script

Astigmatism is corrected by the use of

  1. Convex lens

  2. Concave lens

  3. Cylindrical lens

  4. Surgery
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

  • Convex lens converge the light rays and decrease the focal length.
  • Concave lens diverge the light rays and increase the focal length.
  • Cylindrical lens have curved surfaces that focus the light rays to a point.
Astigmatism occurs due to imperfection in curvature of eye due to which light rays are focussed inaccurately on the retina and this is corrected by using cylindrical lens.
So, the correct answer is 'Cylindrical lens'.

Multiple choice evs we are special defects of eye disorders of nervous system braille script

In old age, the vision of eye becomes dim. It is due to

  1. Myopia

  2. Hypermetropia

  3. Cataract

  4. Astigmatism
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
A. Myopia occurs when eye ball becomes longer and it results in the formation of image in front of retina.
B. Hypermetropia occurs when eye ball becomes shorter and it results in the formation of image behind the retina. 
C. Cataract is an eye disease that occurs in older people. The visibility is reduced because the eye lens becomes opaque
D. In astigmatism, the vision gets blurred due to improper of eye's curvature.
So, the correct answer is 'Cataract'.
Multiple choice evs we are special defects of eye disorders of nervous system braille script

Reduction in elasticity of eye lens with age causes ________.

  1. Myopia

  2. Presbyopia

  3. Cataract

  4. Hypermetropia
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
A. Myopia occurs when eye ball becomes longer and it results in the formation of image in front of retina. It is corrected using concave lens which diverge the light rays to get focussed on the retina.
B. Presbyopia occurs in the late age (generally after 40 years) due to loss of elasticity of eye lens due to which nearby objects are not correctly visible. It is corrected by using bifocal lengths.
C. Cataract is an eye disease that occurs in older people. The visibility is reduced because the eye lens becomes opaque. It is treated by surgery.
D. Hypermetropia occurs when eye ball becomes shorter and it results in the formation of image behind the retina. It is corrected using convex lens which focus the light rays on the retina.
So, the correct answer is 'Presbyopia'.
Multiple choice evs we are special defects of eye disorders of nervous system braille script

The defective condition of eye in which distant objects are seen distinct but near objects are indistinct is called

  1. Myopia

  2. Astigmatism

  3. Presbyopia

  4. Hypermetropia
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
A. Myopia,, also known as short-sightedness, occurs when eye ball becomes longer and it results in the formation of image in front of retina. The nearby objects are seen clearly but distant objects can't be seen. It is corrected using concave lens which diverge the light rays to get focussed on the retina. 
B. In astigmatism, the vision gets blurred due to improper of eye's curvature. It is corrected by using cylindrical lens.
C. Presbyopia occurs in the late age (generally after 40 years) due to loss of elasticity of eye lens due to which nearby objects are not correctly visible. It is corrected by using bifocal lengths
D. Hypermetropia , also known as far-sightedness or long-sightedness, occurs when eye ball becomes shorter and it results in the formation of image behind the retina. The distant objects are visible clearly but nearby objects can't be seen clearly and distinctly. It is corrected using convex lens which focus the light rays on the retina.
So, the correct answer is 'Hypermetropia'.
Multiple choice evs we are special defects of eye disorders of nervous system braille script

Glaucoma is due to

  1. Blocking of canal of Schlemm

  2. Drying up of vitreous humor

  3. Increased size of eye

  4. Opacity of lens
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Glaucoma is a disorder of eye in which the optic nerve is damaged and this leads to blindness. It occurs due to increase in pressure of eye (intraocular pressure) when a fluid is built up in the front part of eye. The fluid builds up when it fails to get drained out due to blockage of canal of Schlemn. Canal of Schlemn is a circular canal that lies at the junction of sclera and cornea, through which excess aqueous humour is drained out from the anterior chamber.
So, the correct answer is 'Blocking of canal of Schlemn'.
Multiple choice evs we are special defects of eye disorders of nervous system braille script

Myopia is corrected by

  1. Cylindrical lens

  2. Bifocal lens

  3. Biconvex lens

  4. Biconcave lens

  5. Plain glass
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Myopia is also known as short-sightedness. It occurs when the eyeball becomes longer or the eye lens get more convex due to which light rays get focussed at a point before the retina and as a result, image is formed in front of retina. It is corrected by using concave lens that diverge the light rays to get focussed on the retina and thus, the image is formed on the retina.
So, the correct answer is 'Biconcave lens'.
Multiple choice evs we are special defects of eye disorders of nervous system braille script

Glaucoma is caused by increase in

  1. Intra-arterial pressure

  2. Intraocular pressure

  3. Intraventricular pressure

  4. Intravesicular pressure
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Glaucoma is an eye disease in which optic nerve is damaged and this leads to damage. It occurs due to build up of a fluid in front part of eye due to which pressure inside the eye called intraocular pressure, is increased. The increased pressure leads to damage of optic nerve. Generally the build up fluid drains out through trabecular meshwork but when the build up fluid fails to get drained out, intraocular pressure increases leading to glaucoma. This occurs in old age people frequently.
So, the correct answer is 'Intraocular pressure'.
Multiple choice evs we are special defects of eye disorders of nervous system braille script

Opacity of eye lens leads to

  1. Glaucoma

  2. Cataract

  3. Presbyopia

  4. Astigamatism
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
A. Glaucoma is a disorder of eye in which the optic nerve which carries visual information to brain, is damaged and this leads to blindness.
B. Cataract is an eye disease that occurs in older people. The visibility is reduced because the eye lens becomes opaque and cloudy. It is treated by surgery.
C. Presbyopia occurs in the late age (generally after 40 years) due to loss of elasticity of eye lens due to which nearby objects are not correctly visible. It is corrected by using bifocal lengths.
D. Astigmatism is a disorder of eye in which there is improper curvature of eye due to which light rays focus inaccurately on retina. It is corrected by using cylindrical lens.
Hence, opacity of eye lens leads to 'Cataract'.
Multiple choice evs we are special defects of eye disorders of nervous system braille script

A serious eye defect which can lead to blindness is

  1. Myopia

  2. Hypermetropia

  3. Presbyopia

  4. Glaucoma
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
A. Myopia occurs when eye ball becomes longer and it results in the formation of image in front of retina.
B. Hypermetropia occurs when eye ball becomes shorter and it results in the formation of image behind the retina.

C. Presbyopia occurs in the late age (generally after 40 years) due to loss of elasticity of eye lens due to which nearby objects are not correctly visible. It is corrected by using bifocal lengths.
D. Glaucoma is a disorder of eye in which the optic nerve which carries visual information to brain, is damaged and this leads to blindness because no visual information will be carried to brain and hence, no image will be formed and perceived.
So, the correct answer is 'Glaucoma'.

Multiple choice evs we are special defects of eye disorders of nervous system braille script

An old person requires spectacles for

  1. Reading

  2. Distant vision

  3. Both A and B

  4. Astigmatism
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The old person requires spectacle for both nearsightedness and farsightedness which is found in presbyopia for correcting near vision and far vision both.

So, the correct answer is 'Both A and B'.