Given below is a diagram depicting a defect of the human eye. Study the same and then answer the questions that follow: Given below is a diagram depicting a defect of the human eye. Study the same and then answer the questions that follow:
Name the defect shown in the diagram.
Topic: Myopia
Answer
MYOPIA (short-sightedness or near-sightedness).
Read the RAY DIAGRAM to identify the defect: if the rays converge to a focus BEFORE reaching the retina, it is MYOPIA; if they would converge BEYOND it, hypermetropia.
In myopia the eye bends light TOO STRONGLY, so the image of a DISTANT object forms in front of the retina and appears blurred. Near objects are seen clearly.
The three common defects, by what the sufferer CANNOT see: MYOPIA — cannot see DISTANT objects (the classroom blackboard problem) HYPERMETROPIA — cannot see NEAR objects (the threading-a-needle problem) PRESBYOPIA — the same as hypermetropia but caused specifically by the AGEING of the lens