Visual Defects (Grade 12 NSC Matric Life Sciences): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
In myopia, where do light rays from distant objects focus?
In myopia, where do light rays from distant objects focus?
In front of the retina
Which type of lens corrects short-sightedness?
Which type of lens corrects short-sightedness?
Concave lens
Where does light focus in a long-sighted eye when viewing nearby objects?
Where does light focus in a long-sighted eye when viewing nearby objects?
Behind the retina
What type of lens is used to correct hyperopia?
What type of lens is used to correct hyperopia?
Convex lens
What causes astigmatism?
What causes astigmatism?
Irregular cornea or lens shape
How does astigmatism affect vision at different distances?
How does astigmatism affect vision at different distances?
Blurred at all distances
What happens to the lens in cataracts?
What happens to the lens in cataracts?
Becomes cloudy or opaque
What is the treatment for advanced cataracts?
What is the treatment for advanced cataracts?
Surgery to replace the lens
What does a concave lens do to light rays?
What does a concave lens do to light rays?
Diverges (spreads out) light rays
What is the fundamental cause of visual defects like myopia and hyperopia?
What is the fundamental cause of visual defects like myopia and hyperopia?
Light not focusing properly on retina