A hand-held magnifier has a power of +10 D. When used by an unaccommodated emmetrope it is held at a distance of 20cm from his eyes. What is the relative distance mag (or effective mag for 40 cm reference distance)? Can the patient vary the distance of the magnifier from his eye? What happens to the magnification if he holds it at 30 cm? what happens to the field of view at 30 cm?
Any low vision gurus out there? I could use a little help... thanks
Any low vision gurus out there? I could use a little help... thanks