Hi again!
What is the magnification in direct ophthalmoscopy, assuming the subject's eye to be 25mm from the sight hole, when the subject has -4.00D myopia?
I assume it is more that 15x but I have 15.56 or 16.67 to choose from and I don't know how to get the correct answer.
What is the reflex speed if using a plane-mirror retinoscope at a working distance of 1/2M, with a patient with a -10DS error?
As i've never heard of the reflex speed being 'quantified' before, I don't know where to start...
Appreciate your time as always...
Hannah
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