a What is short sightedness ? State the two causes of short sightedness or myopia. With the help of ray diagrams, show : i the eye defect short sightedness. ii correction of
What is The Difference Between Myopia, Hyperopia, and Presbyopia? - New Optical Palace
Nearsightedness, farsightedness, and astigmatism. What's the difference?
Farsightedness - Wikipedia
Eye correction is seriously short sighted | New Scientist