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Ophthalmology MCQ

By AdminPosted On 05-Oct-2016

1. Chalazion : Ophthalmology MCQ


Recurrent chalazion is predisposed to develop


a) Basal cell carcinoma

b) Adenocarcinoma

c) Squamous cell carcinoma

d) Epidermoid carcinoma

Correct Answer: None. Nowhere recurrent chalazion is mentioned as a risk factor/ predisposing factor or etiological factor for any of the eyelid cancers. Recurring chalazia may sometimes be a symptom of sebaceous cell carcinoma, but rarely. Sebaceous carcinoma is an aggressive cancer that normally occurs on the upper eyelid and is associated with radiation exposure, Bowen's disease, and Muir-Torre syndrome. Basal cell carcinoma is the most common type of eyelid tumour, accounting for about 85% of all eyelid tumours and they are directly related to exposure to the sun.


2. Protanopia : Ophthalmology MCQ


Protanopia implies complete abnormality in which of the following colours


a) Red

b) Blue

c) Green

d) Yellow

Correct Answer: a) Red. Colour-blind persons may be blind to one, two, or all of the colours red, green, and blue. (Blindness to red is called protanopia; to green, deuteranopia; and to blue, tritanopia.) Red-blind persons are ordinarily unable to distinguish between red and green, while blue-blind persons cannot distinguish between blue and yellow.


3. Fluorescein angiography : Ophthalmology MCQ


Fluorescein angiography is used to identify lesions in all of the following except


a) Retina

b) Iris

c) Lens

d) Optic nerve head

Correct Answer: c) Lens. Fluorescein angiography is used by ophthalmologists to evaluate the vasculature of the retina, choroid, optic disc, and iris. Among the common groups of ophthalmologic disease, fluorescein angiography can detect diabetic retinopathy (neovascularization), vein occlusions, retinal artery occlusions, edema of the optic disc, and tumors.


4. Eye Drops Vs Ear Drops


One can always put ear drops in eyes, but not eye drops in ears.


a) True

b) False


Correct Answer: b) False. Personally I wont recommend vice-versa also because of fear of inadvertent use without the complete knowledge. Ear drop medications should NOT be used in the Eye because preservatives used in eye drop preparations are much gentler than those used in ear drops due to the eyeball being much more sensitive compared to the ear. As such, it may burn if ear drops are used in the eye... but not vice-versa.


• Floxin (Ear) equivalent to Ocuflox (Eye)

• Ciprodex (Ear) equivalent to Ciloxan (Eye) without the steroid dexamethasone

• Cipro HC (Ear) equivalent to Ciloxan (Eye) without the steroid hydrocortisone

• Cortisporin (neomycin-polymyxin-hydrocortisone) is available in both eye and ear preparations

• Tobradex (Eye) can be used in the ear and is imprecisely similar to Cortisporin (Eye/Ear).


5. What the two true colors of human eyes?


a) Green and Brown

b) Blue and Brown

c) Hazel and Blue

d) Blue and Green

e) Brown to black

Correct Answer: e) Brown to black. Eye color or eye colour is a polygenic phenotypic character determined by two distinct factors: the pigmentation of the eye's iris and the frequency-dependence of the scattering of light by the turbid medium in the stroma of the iris.

In humans, the pigmentation of the iris varies from light brown to black, depending on the concentration of melanin in the iris pigment epithelium, the melanin content within the iris stroma, and the cellular density of the stroma. The appearance of blue and green, as well as hazel eyes, results from the Rayleigh scattering of light in the stroma, a phenomenon similar to that which accounts for the blueness of the sky. Neither blue nor green pigments are ever present in the human iris or ocular fluid.


6. Pupils : Ophthalmology MCQ


The pupil is dilated by the following being put into the conjunctival sac


a) Ephedrine

b) Timolol

c) Homatropine

d) Cocaine

e) Chloramphenicol


Correct Answer: a,c,d. Timolol is a non-selective beta-adrenergic receptor antagonist indicated for treating glaucoma. Chloramphenicol is an antibiotic. Cocaine users often have dilated pupils when they are high on the drug.


7. The intraocular pressure : Ophthalmology MCQ


a) Normally less than 5 mmHg

b) Lowered by the administration of suxamethonium

c) Increases with coughing

d) May be normal in closed-angle glaucoma

e) Can be lowered by the use of acetazolamide


Correct Answer: c,d,e. Normal intraocular pressure as that between 10 mmHg and 20 mmHg. Use of suxamethonium is associated with an increase in intraocular pressure

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