Pg Blazer - Online Test Series 7 – Ophthalmology | Attempts: 2976

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Quizzes Created: 37 | Total Attempts: 133,673

Questions: 10 | Attempts: 2,976 | Updated: Mar 21, 2023

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Pg Blazer - Online Test Series 7 Ophthalmology - Quiz

MCQ's in Ophthalmology. For more practice tests, go to PG Blazer Online Test Series

Questions and Answers

1.

Hyaluronic acid is present in?
- A.
  
  Aqueous humor
- B.
  
  Vitreous humor
- C.
  
  Lens
- D.
  
  Cornea
Correct Answer
B. Vitreous humor

Explanation
Correct answer : Vitreous humor, Hyaluronic acid is also present in cartilage, synovial fluid and loose connective tissue.

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2.

Which of the following does not handle the oxidative damage in the lens?
- A.
  
  Vitamin C
- B.
  
  Vitamin A
- C.
  
  Glutathione
- D.
  
  Catalase
Correct Answer
B. Vitamin A

Explanation
Antioxidants that function to prevent oxidative damage in the lens:
-Superoxide dismutase
-Catalase
-Glutathione peroxidase
-Vitamin C
-Vitamin E

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3.

Disease with autosomal dominant inheritance is
- A.
  
  Best’s disease
- B.
  
  Bassen Kornzweig disease
- C.
  
  Gyrate atrophy
- D.
  
  Laurence Moon Biedl syndrome
Correct Answer
A. Best’s disease

Explanation
Bassen Kornzweig disease, Gyrate atrophy and Laurence Moon Biedl syndrome - Autosomal recessive inheritance
Best's disease - Autosomal dominant inheritance

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4.

All are common causes of childhood blindness except
- A.
  
  Malnutrition
- B.
  
  Glaucoma
- C.
  
  Ophthalmia neonatorum
- D.
  
  Congenital dacryocystitis
Correct Answer
D. Congenital dacryocystitis

Explanation
Congenital dacryocystitis usually does not cause blindness.

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5.

Occulomotor nerve palsy causes all except :
- A.
  
  Miosis
- B.
  
  Ptosis
- C.
  
  Outward eye deviation
- D.
  
  Diplopia
Correct Answer
A. Miosis

Explanation
Occulomotor nerve supplies:
Superior rectus
Inferior rectus
Medial rectus
Inferior oblique
Levator palpebrae superioris
Parasympathetic supply from ciliary ganglion to sphincter pupillae and ciliary body

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6.

A patient presented with unilateral proptosis which was compressible and increases on bending forward. No thrill or bruit was present. MRI shows a retroorbital mass with enhancement. The likely diagnosis is -
- A.
  
  AV malformations
- B.
  
  Orbital encephalocoele
- C.
  
  Orbital varix
- D.
  
  Neurofibromatosis
Correct Answer
C. Orbital varix

Explanation
Proptosis that increases with Valsalva manouvre or bending forwards is probably due to vascular lesions such as orbital varix.

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7.

The following ocular structure is not derived from surface ectoderm:
- A.
  
  Crystalline lens
- B.
  
  Sclera
- C.
  
  Corneal epithelium
- D.
  
  Epithelium of lacrimal glands
Correct Answer
B. Sclera

Explanation
Sclera is derived from paraxial mesoderm

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8.

True stereopsis is perceived due to the following:
- A.
  
  Overlay of contours
- B.
  
  Motion parallax
- C.
  
  Bi-nasal disparity
- D.
  
  Linear perspective
Correct Answer
C. Bi-nasal disparity

Explanation
The 2 eyes see the eyes from a slightly different angle. Hence the image formed is different. (Binasal retinal image disparity). When these images are fused, we get the impression of binocular vision.

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9.

Which one ofthe following statements, concerning persistent hyperplastic primary vitreous (pHPV) is true?
- A.
  
  It is generally unilateral
- B.
  
  Visual prognosis is usually good
- C.
  
  It may calcify
- D.
  
  It is most easily differentiated from retinoblastoma by the presence of exophthalmos or cataract
Correct Answer
A. It is generally unilateral

Explanation
PHPV does not undergo calcification. The visual prognosis is poor.
Differentiating features compared to retinoblastoma : Microphthalmos, presence of cataract, unilateral nature, no calcification in CT scan, no family history

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10.

The laser procedure, most often used for treating iris neovascularization, is:
- A.
  
  Goniophotocoagulation
- B.
  
  Laser trabeculoplasty
- C.
  
  Panretinal photocoagulation (PRP)
- D.
  
  Laser iridoplasty
Correct Answer
C. Panretinal pHotocoagulation (PRP)

Explanation
Panretinal photocoagulation is the treatment of choice for neovascularization of iris. It stops the angiogenic stimulus from the retina which is responsible for neovascularization.

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Current Version
Mar 21, 2023

Quiz Edited by
ProProfs Editorial Team
Jun 08, 2011

Quiz Created by
Pgblazer

Pg Blazer - Online Test Series 7 – Ophthalmology

Hyaluronic acid is present in?

Which of the following does not handle the oxidative damage in the lens?

Disease with autosomal dominant inheritance is

All are common causes of childhood blindness except

Occulomotor nerve palsy causes all except :

A patient presented with unilateral proptosis which was compressible and increases on bending forward. No thrill or bruit was present. MRI shows a retroorbital mass with enhancement. The likely diagnosis is -

The following ocular structure is not derived from surface ectoderm:

True stereopsis is perceived due to the following:

Which one ofthe following statements, concerning persistent hyperplastic primary vitreous (pHPV) is true?

The laser procedure, most often used for treating iris neovascularization, is: