Acanthamoeba keratitis?

Question 1: An 18 year old boy comes to the eye casualty with history of
injury with a tennis ball. On examination there is no perforation but there
is hyphaema. The most likely source of the blood is ?
A) Iris vessels
B) Circulus iridis major
C) Circulus iridis minor
D) Short posterior ciliary vessels
Answer: A) Iris vessels

Question 2: A 25 year old male gives history of sudden painless loss of
vision in one eye for the past 2 weeks. There is not history of trauma. On
examination the anterior segment is normal but there is no fundal glow.
Which one of the following is the most likely cause ?
A) Vitreous haemorrhage
B) Optic atrophy
C) Developmental cataract
D) Acute attack of angle closure glaucoma
Answer: A) Vitreous haemorrhage

Question 3: The mother of a one and a half year old child gives history
of a white reflex from one eye for the past 1 month. On computed tomography
scan of the orbit there is calcification seen within the globe. The most
likely diagnosis is ?
A) Congenital cataract
B) Retinoblastoma
C) Endophthalmitis
D) Coats disease
Answer: B) Retinoblastoma

Question 4: Enlarged corneal nerves may be seen in all of the following
except ?
A) Keratoconus
B) Herpes simplex keratitis
C) Leprosy
D) Neurofibromatosis
Answer: B) Herpes simplex keratitis

Question 5: Under the WHO ‘Vision 2020’ programme, the ‘SAFE’ strategy is
adopted for which of the following diseases ?
A) Trachoma
B) Glaucoma
C) Diabetic retinopathy
D) Onchocerciasis
Answer: A) Trachoma

Question 6: Horner’s syndrome is characterized by all of the following
except ?
A) Miosis
B) Enophthalmos
C) Ptosis
D) Cycloplegia
Answer: D) Cycloplegia

Question 7: The superior oblique muscle is supplied by ?
A) 3rd cranial nerve
B) 4th cranial nerve
C) 5th cranial nerve
D) 6th cranial nerve
Answer: B) 4th cranial nerve

Question 8: Which of the following statement is true regarding
Acanthamoeba keratitis ?
A) For the isolation of the causative agent, corneal scraping should be
cultured on a nutrient agar plate
B) The causative agent, Acanthamoeba is a helminth whose normal habitat is
soil
C) Keratitis due to Acanthamoeba is not seen in the immunocompromised host
D) Acanthamoeba does not depend upon a human host for the completion of its
life-cycle
Answer: D) Acanthamoeba does not depend upon a human host for the
completion of its life-cycle

Question 9: A 30 year old man has 6/5 vision each eye, unaided. His
cycloplegic retinoscopy is +1.0 D sph. at 1 metre distance. His complaints
are blurring of newsprint at 30 cm, that clears up in about two minutes.
The most probable diagnosis is ?
A) Hypermetropia
B) Presbyopia
C) Accomodative inertia
D) Cycloplegia
Answer: C) Accomodative inertia

Question 10: Contact lens wear is proven to have deleterious effects on
the corneal physiology. Which of the following statements is incorrect in
connection with contact lens wear ?
A) The level of glucose availability in the corneal epithelium is reduced
B) There is a reduction in hemidesmosome density
C) There is increased production of CO2 in the epithelium
D) There is a reduction in glucose utilization by corneal epithelium
Answer: A) The level of glucose availability in the corneal epithelium is
reduced