The following questions relate to retina magnification and opthalmoscope 
(Assuming an emmetrope has a total refractive power of 60D).

a. Direct ophthalmoscopy

i. Calculate the magnification of an emmetrope retina when examined with a 
   direct ophthalmoscope.

ii. When viewed by an emmetrope ophthalmologists, does a myope's optic disc 
    look bigger or smaller than an emmetrope?
 

b. Indirect ophthalmoscopy

i. Calculate the magnification of an emmetrope retina when viewed with an 
   indirect ophthalmoscope using a 20 D lens.

ii. What is the magnification of an emmetrope retina when viewed with a 15D lens?