Concept explainers
(a)
To determine: The mechanism by which the convex and concave corrective lenses alter the path of light refraction.
Introduction: The eye is divided into various parts based on the functions performed. The lens is the transparent, biconvex structure that is located at the front portion of the eye and functions to refract the light along with the cornea.
(b)
To determine: The type of lens that is used to correct myopia.
Introduction: The shape of the lens can be altered in some individuals which leads to the decrease in the property of vision. When the image is formed in front of the retina, the disease is called myopia.
To determine: The type of lens that is used to correct hyperopia.
Introduction: The shape of the lens is changed in some individuals which leads to the decrease in the property of vision. When the image is formed beyond the retina, it is called hyperopia.
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Human Physiology: An Integrated Approach (8th Edition)
- Name one defect of vision which cannot be corrected by any type of spectacle lenses?arrow_forwardHow does the eye’s lens change shape to allow focusing of distant objects? What defects make focusing on distant objects impossible, and what is this condition called? What type of lens can be used to correct it, and how does the lens do so?arrow_forwardA person with a myopic eye cannot see objects beyond 1.2 m distinctly. What should be the corrective lens used to restore proper vision?arrow_forward
- describe the differences between normal, nearsighted, andfarsighted eyes and explain how defective focusing can becorrected by artificial lenses?arrow_forwardName the muscle responsible for bringing change in the focal length of the eye lens?arrow_forwardWhat is the definition of tympanometry?arrow_forward
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