Why do people over 55 often need reading glasses? a. Their cornea no longer focuses correctly. b. Their lens no longer focuses correctly. c. Their eyeball has elongated with age, causing images to focus in front of their retina. d. Their retina has thinned with age, making vision more difficult.

Why do people over 55 often need reading glasses? a. Their cornea no longer focuses correctly. b. Their lens no longer focuses correctly. c. Their eyeball has elongated with age, causing images to focus in front of their retina. d. Their retina has thinned with age, making vision more difficult.

Body Structures & Functions Updated

13th Edition

ISBN:9780357191606

Author:Scott

Publisher:Scott

Chapter10: Special Senses

Section: Chapter Questions

Problem 5RQ

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Myopia is a condition in which a person has: a. light rays focusing in front of the retina due to a flattened cornea b. light rays focusing in front of the retina due to a short eyeball c. light rays focusing in front of the retina due to a cornea that is too curved d. light rays focusing in front of the retina due to a detached retina
Myopia is a condition in which a person has Select one: a. light rays focusing in front of the retina due to a flattened cornea b. light rays focusing in front of the retina due to a short eyeball c. light rays focusing in front of the retina due to a cornea that is too curved d. light rays focusing in front of the retina due to a detached retina
If someone is born with dense cataracts on both eyes, and the cataracts are removed years later, what happens?A. The person remains permanently blind.B. The person gradually recovers all aspects of vision.C. The person gains some vision, but remains impaired on object recognition, motion vision, and depth perception.D. The person gains almost all aspects of vision, but remains greatly impaired on color perception.
When reading, a person with astigmatism sees some lines in sharp focus while others appear blurred. Astigmatism is caused by the a. inability of the iris to contract or dilate b. lens becoming cloudy and rigid c. number of cones on some parts of the retina being deficient d. curvature of the cornea or lens not being symmetrical
1. Match the parts of the eye with their functions: A. choroid coat 1. regulates the shape of the lens B. optic nerve 2. opening through with light enters the eye C. retina 3. carries impulses from the eye to the brain D. sclera 4. allows for sharp images by absorbing scattered light rays E. ciliary body 5. liquid which helps to maintain shape of F. iris eye G. cornea 6. transparent outer layer that refracts light 7. receives the image and changes it to an impulse H. pupil I. aqueous and vitreous humor 8. regulates the size of the pupil 9. tough, white outer coat of the eye
Which of the following is true about infants’ visual acuity? a. Poor visual acuity early in life allows key features of the visual world to “pop out” b.Before 3 months, infants are not able to make sense of their visual world c.It’s not possible to test visual acuity before infants are 6 months d.Newborns have poor visual acuity, but excellent colour vision
Vision is a complex process. The human eye has many structures that contribute to vision. Which of the following statements describing the structures involved in the process of vision is NOT correct? a. Ciliary muscles change the shape of the lens to focus both near and distant objects. b. The cornea and lens bend light to focus the image on the retina. c. The iris relaxes and contracts to protect the retina from excess light. d. Lenses move forward or backward to control the amount of light striking the retina.
When reading, a person with astigmatism sees some lines in sharp focus while others appear blurred. Astigmatism is caused by the Select one: a. inability of the iris to contract or dilate b. lens becoming cloudy and rigid c. number of cones on some parts of the retina being deficient O d. curvature of the cornea or lens not being symmetrical
As people age, the lens of the eye becomes ____, which leads to a type of farsightedness called _____. a. less flexible; hyperopia b. less flexible; presbyopia c. more flexible; hyperopia d. more flexible; presbyopia
If someone is color-blind, which structure is malfunctioning? A.None B.Cones C.Cornea D.Rods E.Optic disc F. All are correct.
Occlusion is a. the condition in which object properties don’t change when viewed from different angles. b. the idea that numerous physical stimuli can create the same image on the retina. c. when one object partially covers another. d. when the stimulus on the receptors is ambiguous.
Choose the structure that corresponds to each statement. a. bipolar cell layer e. macula lutea b. central fovea f. optic disc c. cones g. photoreceptor layer d. ganglion cell layer h. rods 1. has the highest density of cones in the retina 2. axons form optic nerve 3. does not contain photoreceptors; blind spot 4. photoreceptor that allows us to see color 5. contains rods and cones 6. the center of the neural portion of the retina 7. photoreceptor used in night vision 8. rods and cones synapse on these cells