Station seven
(5 minutes allowed)

The size of the optic disc determines the size of the optic cup. A large disc 
has a larger cup and vice versa. The size can be measured on a slit-lamp 
with a lens by projecting a thin focused white line on to the disc. Supposing 
the above disc measures 2.0 mm on the slit-lamp. What would be its actual 
size if the lens used is:
a. 60D
b. 78D
c. 90D?
To station 8
Return to mock examination 20