Fundamentals of Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134396026
Author: Frederic H. Martini, Judi L. Nath, Edwin F. Bartholomew
Publisher: PEARSON
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Chapter 17, Problem 8RQ
Summary Introduction
Introduction:
The ability of a person to observe an object with clarity is called visual acuity. It is based on various parameters such as the sharpness of the vision, the proper function of retina.
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A 10-year-old patient’s distance visual acuity was tested and determined to be 20/80. (a) Explain what that means. (b) Is 20/80 better or worse than 20/20? Explain.
1. A 10-year-old patient’s distance visual acuity was tested and determined to be 20/80.
(a) Explain what that means.
(b) Is 20/80 better or worse than 20/20? Explain.
2. A 60-year-old man has to hold his newspaper at arm’s length to read it. What condition does he have?
The least distance of distinct vision for an eye lens is caused by the action of the:(a) 25 m(b) 2.5 cm(c) 25 cm(d) 2.5 m
Chapter 17 Solutions
Fundamentals of Anatomy & Physiology (11th Edition)
Ch. 17 - Prob. 1CPCh. 17 - Prob. 2CPCh. 17 - Prob. 3CPCh. 17 - Prob. 4CPCh. 17 - If you completely dry the surface of your tongue...Ch. 17 - Prob. 6CPCh. 17 - Prob. 7CPCh. 17 - Prob. 8CPCh. 17 - Prob. 9CPCh. 17 - Prob. 10CP
Ch. 17 - Prob. 11CPCh. 17 - Prob. 12CPCh. 17 - Prob. 13CPCh. 17 - Prob. 14CPCh. 17 - Prob. 15CPCh. 17 - Prob. 16CPCh. 17 - Prob. 17CPCh. 17 - Prob. 1RQCh. 17 - Prob. 2RQCh. 17 - A blind spot occurs in the retina where (a) the...Ch. 17 - Sound waves are convened into mechanical movements...Ch. 17 - The basic receptors in the internal ear are the...Ch. 17 - Prob. 6RQCh. 17 - At sunset, your visual system adapts to (a) fovea...Ch. 17 - Prob. 8RQCh. 17 - The malleus, incus, and stapes are the tiny bones...Ch. 17 - Identify the structures of the external, middle,...Ch. 17 - Prob. 11RQCh. 17 - Prob. 12RQCh. 17 - Prob. 13RQCh. 17 - Prob. 14RQCh. 17 - Prob. 15RQCh. 17 - Prob. 16RQCh. 17 - Prob. 17RQCh. 17 - Prob. 18RQCh. 17 - Prob. 19RQCh. 17 - Prob. 20RQCh. 17 - Prob. 21RQCh. 17 - Prob. 22RQCh. 17 - Prob. 23RQCh. 17 - Prob. 24RQCh. 17 - Prob. 25RQCh. 17 - Prob. 26RQCh. 17 - Prob. 27RQCh. 17 - Prob. 28RQCh. 17 - Prob. 1CCCh. 17 - Prob. 2CC
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- Distance between the eye and eye chart must be 6 meter during examination of visual acuity. Why?arrow_forwardSelect the best answer or answers from the choices given: Damage to the medial recti muscles would probably affect (a) accommodation, (b) refraction, (c) convergence, (d) pupil constriction.arrow_forwardWhy must the subject hold the Snellen acuity card close to his or her eyes to test near vision?arrow_forward
- Why must the subject stand 20 feet from the Snellen eye chart to test distance vision?arrow_forwardWhat should be the distance between Mr. Saleto and the Snellen chart? 6ftaway What instructions can Casey give to Mr. Saleto if he uses glasses? By using the Snellen chart, is Cassey testing distance or near visual acuity? What does it mean if the result of the test is 20/60? What are some nonverbal cues that may indicate that the patient is having difficulty reading the line to which Cassey is pointing?arrow_forwardDamage to the right optic nerve would result in what type of visual field deficit? Question 6 options: A) Blindness in the majority of the left visual field (both binocular and monocular) B) Blindness in the majority of the right visual field (both binocular and monocular) C) Blindness in the majority of both monocular visual fields D) Blindness in the binocular visual field E) Blindness in the majority of the right monocular visual field F) Blindness in the majority of the left monocular visual fieldarrow_forward
- What is the least distance of distinct vision of a normal human eye?arrow_forwardcan you explain to me what does the numerator and denominator mean in the visual acuity chart?arrow_forwardPresbyopia is a condition in which a person's ability to adjust to changes in visual acuity diminishes or disappears entirely. Will she still require reading glasses after LASIK to correct her far vision? Explain.arrow_forward
- b) When the muscles connected to the crystalline lens contract fully, its focal length is 16.5000 cm. With this focal length, how far away must an object be to form sharply focused images on the retina? (Note: this distance is called the far point of vision.)arrow_forwardJane makes an appointment with the optometrist for a vision test. Her test results for visual acuity are reported as 20/15. What does this test result mean? Is a rating of 20/20 better or worse?arrow_forwardDefine the term tympanometry?arrow_forward
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