Eye Disorders and Refractive Errors Quiz
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Questions and Answers

Which eye defect is characterized by the inability to focus on near objects due to a gradual loss of the crystalline lens elasticity?

  • Myopia
  • Astigmatism
  • Hypermetropia
  • Presbyopia (correct)
  • What type of corrective lenses are required for individuals with farsightedness?

  • Convex lenses (correct)
  • Special lenses affecting light rays on one of the planes
  • Concave lenses
  • No corrective lenses needed
  • What is the cause of myopia?

  • Weak refractive power of the eye
  • Gradual loss of crystalline lens elasticity
  • Long eyeball or strong refractive power (correct)
  • Cornea not curving correctly
  • Which eye defect requires special lenses to affect light rays on one of the planes?

    <p>Astigmatism</p> Signup and view all the answers

    In which condition are light rays focused behind the retina, resulting in a confused image?

    <p>Hypermetropia</p> Signup and view all the answers

    What is the main characteristic of daltonism?

    <p>Colour blindness for some colours</p> Signup and view all the answers

    Which eye defect is due to the eye's refractive power being too weak?

    <p>Hypermetropia</p> Signup and view all the answers

    Study Notes

    Eye Defects and Conditions

    • Presbyopia is characterized by the inability to focus on near objects due to a gradual loss of the crystalline lens's elasticity, commonly affecting individuals as they age.

    • Individuals with farsightedness, or hyperopia, require convex lenses to help converge light rays before they enter the eye, allowing for clearer vision of nearby objects.

    • Myopia, also known as nearsightedness, is caused by an elongation of the eyeball or excessive curvature of the cornea, resulting in light rays focusing in front of the retina.

    • Astigmatism requires special lenses that are cylindrical in shape, which correct light rays on one specific plane to achieve a clear image.

    • In hyperopia, light rays focus behind the retina, leading to blurred vision and confusion in visual perception.

    • Daltonism, or color blindness, is primarily characterized by the inability to distinguish certain colors, typically red and green, due to the absence or malfunction of specific cone cells in the retina.

    • Myopia is also described as a condition due to the eye's refractive power being too strong, which contributes to the misfocusing of light.

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    Description

    Test your knowledge on eye disorders and refractive errors such as myopia and hyperopia. Learn about common defects related to the lens, receptors, and cornea affecting vision.

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