Hello,

This is my first thread on here.

My classmate and I are stumped by a blurred circle question in our exercise pack (2nd year students in 3 year Dispensing Optics course).

The questions wants the blurred circle size but only gives three pieces of information.

The patient's eye is an axially myopic.
A point object is viewed at 6 metres distance.
And the pupil diameter is 6mm.

We've inferred the axial myopia means the axial length of the eye is greater than +22.22mm.
And figure we need to fill out the rest of the formula -
Blurred Image size = Pupil Size x (Dioptric Power ÷ Refractive Error).

We just don't know what steps we need to take from there or even how the 6m distance helps at all in order to get the Dioptric Power or Refractive Error to fill in the rest of the formula.

Any Dispensers who see this, your help would mean a lot to us.