- Defects of the eye (myopia, hyperopia hypermetropia, presbiopia, astigmatism and cataract) and corrective measures (diagrams included for myopia and hyperopia only)
Describe the mechanism of focusing the image of a distant object in your eye when you raise your head after reading a book.
Given below is a diagram depicting a defect of the human eye. Study the same and answer the questions that follow:
(a) Name the defect shown in the diagram
(b) Give two possible reasons for this defect
(c) Name the parts labelled 1 to 4
(d) Name the type of lens used to correct this eye defect
(e) Draw a labelled diagram to show how the above mentioned defect is rectified using the lens named above.
the biological/technical terms for the lens of eye losing flexibility resulting in a kind of long-sightedness in middle aged people.
Differentiate between members of the following pair with reference to what is asked in bracket.
Rods and cones (sensitivity)