1. Adenoid cystic carcinoma of the lacrimal gland: 

a. may arise from pleomorphic adenoma

b. is not encapsulated

c. causes bony erosion

d. causes pain from perineural invasion

e. basaloid cell is associated with the worst prognosis.
 

Answera.T   b.T   c.T   d.T  e.T
It is a highly malignant condition and is associated with high mortality.

2. Blood staining of the cornea: 

a. is a common complication following trabeculectomy

b. red blood cells are seen in the stroma

c. iron is found in the keratocytes

d. causes siderosis bulbi

e. is an irreversible condition

Answera.F   b.F   c.T   d.F   e.F
Blood staining of the cornea is caused by the presence
of haemoglobin within the stroma. Later iron is found in
the keratocytes. High IOP in the presence of hyphaema 
increases the likelihood of corneal blood staining. 
However, it can also occur in lower IOP if the endothelium is compromised.

3. Bitot's spots: 

a. occur in patients with fat malabsorption

b. are commonest on the nasal side of the conjunctiva

c. are caused by hyperplasia of the goblet cells

d. usually precede keratopathy

e. resolve with oral vitamin A

Answera.T   b.F   c.F   d.T   e.T
Vitamin A is fat soluble and therefore may be deficient in patients with fat malabsorption. 
Bitot's spots are made up of desquamated keratinized 
conjunctiva and most commonly found on the temporal bulbar conjunctiva.

4. Oncocytoma: 

a. is most commonly found in the caruncle

b. is malignant in 50% of cases

c. arises from the stroma

d. contain abnormal mitochondria 

e. has a high recurrence rate following excision

Answera.T   b.F   c.F   d.T  e.F
Oncocytoma arises from the ductal cell lining of 
apocrine glandular structures. It is a rare tumour 
and most commonly affects the caruncle (lacrimal 
gland may be involved). The majority is benign and 
simple excision is usually all that is needed. At high power, the cells show abnormal mitochondria.

a

5. The following are true about staining in the microbes:

a. Gram negative bacteria appear red

b. Gram positive bacteria appear blue 

c. Gomori methamine silver stains fungi green

d. calcofluor white stains acanthamoeba red

e. Ziehl-Neelsen's stain give acid fast bacteria a red colour
 

Answera.T   b.T   c.F  d.F   e.T
Gomori methamine silver stains fungi black. Calcofluor 
white is a chemofluorescent stain and give acanthamoeba a green fluorescence.