Pg Blazer - Online Test Series 7 – Ophthalmology
MCQ's in Ophthalmology. For more practice tests, go to PG Blazer Online Test Series
- 1.
Hyaluronic acid is present in?
- A.
Aqueous humor
- B.
Vitreous humor
- C.
Lens
- D.
Cornea
Correct Answer
B. Vitreous humorExplanation
Correct answer : Vitreous humor, Hyaluronic acid is also present in cartilage, synovial fluid and loose connective tissue.Rate this question:
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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 AExplanation
Antioxidants that function to prevent oxidative damage in the lens:
-Superoxide dismutase
-Catalase
-Glutathione peroxidase
-Vitamin C
-Vitamin ERate this question:
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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 diseaseExplanation
Bassen Kornzweig disease, Gyrate atrophy and Laurence Moon Biedl syndrome - Autosomal recessive inheritance
Best's disease - Autosomal dominant inheritanceRate this question:
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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 dacryocystitisExplanation
Congenital dacryocystitis usually does not cause blindness.Rate this question:
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- 5.
Occulomotor nerve palsy causes all except :
- A.
Miosis
- B.
Ptosis
- C.
Outward eye deviation
- D.
Diplopia
Correct Answer
A. MiosisExplanation
Occulomotor nerve supplies:
Superior rectus
Inferior rectus
Medial rectus
Inferior oblique
Levator palpebrae superioris
Parasympathetic supply from ciliary ganglion to sphincter pupillae and ciliary bodyRate this question:
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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 varixExplanation
Proptosis that increases with Valsalva manouvre or bending forwards is probably due to vascular lesions such as orbital varix.Rate this question:
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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. ScleraExplanation
Sclera is derived from paraxial mesodermRate this question:
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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 disparityExplanation
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.Rate this question:
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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 unilateralExplanation
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 historyRate this question:
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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.Rate this question:
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Mar 21, 2023Quiz Edited by
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Jun 08, 2011Quiz Created by
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