Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Textbook Question
Chapter 36, Problem 37CTQ
Cataracts, the medical condition where the lens of the eye becomes cloudy, are a leading cause of blindness. Describe how developing a cataract would change the path of light through the eye.
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Chapter 36 Solutions
Biology 2e
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- As has been done since the beginning of time, removing the lens of the eye for the purpose of cataract surgery, why would you anticipate a spectacle lens of about 16 D to be prescribed?arrow_forwardDuring a routine eye exam, Lilibeth, a 45-year-old woman mentions to her optometrist that her glasses no longer allow her to see small prints, although they help her to see signs and distant objects while driving. She expresses further that she has been experiencing this problem for about a year, but it has gotten worse in the past few months. The optometrist recommended bifocal and also test Maybelle's eyes with a device that blows a puff of air on the cornea to measure the intraocular pressure. The results of this test are normal. What can you conclude about Maybelle's vision?arrow_forwardPut the following parts of the eye in the order in which light would pass through them: anterior chamber w/ aqueous humor, cornea, iris w/pupil, lens, posterior chamber w/aqueous humor, retina, vitreous chamber w/ vitreous body, optic nerve THIS IS NOT AND WILL NOT BE GRADEDarrow_forward
- E A H C J D 'K Match the labelled eye structure with the correct eye condition or eye function. Contains the photoreceptors (rods and cones) Glaucoma results if this fluid is not drained properly Sensory neurons to the brain : Captures stray light and contains nourishing blood vessels Contains a high concentration of cones Cataracts can develop in this structure Refracts (bends) light rays into the eye The blind spot: no photoreceptors are located here Protects and supports the eyeball Supports the eyeball with the gel-like fluid The opening for light to enter the inner eyearrow_forwardGive a brief account of Mechanism of vision.arrow_forwardMention the benefits of the third eyelid in surgery to treat corneal ulcers.arrow_forward
- Match the function with the correct structure. 1. Absorbs scattered light Sclera 2. Photoreceptors of the retina responsible for Vitreous humour colour vision 3. Refracts light rays into the eye Ciliary muscles 4. Supports the eyeball with the fluid they Iris contain 5. Alters the shape of the lens to promote Cones focusing Lens 6. Protects and supports the eyeball 7. Area that contains a high density of cones Choroid 8. Photoreceptors of the retina sensitive to dim Fovea centralis light 9. Focuses the light rays on the fovea centralis Rods 10. Regulates the amount of light that enters Cornea the eyearrow_forwardIdentify the following structures and sketch them in the spaces provided: 1. Cornea 2. Anterior cavity containing aqueous humor 3. Iris 4. Pupil 5. Lens 6. Zonular fibers of the lens 7. Ciliary body a. Ciliary processes b. Ciliary muscle 8. Vitreous chamber containing vitreous body 9. Sclera 10. Choroid 11. Retina a. Macula lutea i. Fovea centralis b. Rods c. Cones 12. Optic disc 13. Optic nerve (cranial nerve II) 14. Primary visual cortex of the brainarrow_forwardAlbinism is a condition in which melanin pigment is not made. How do you think vision is affected by albinism? When Mrs. Martinez visits her opthalmologist, she complains of pain in her right eye. the intraocular pressure is found to be abnormally elevated. What is the name of Mrs. Martinez's probable condition? What causes it? What might be the outcome if the problem is not corrected?arrow_forward
- Structures of the Eye Label the structures of the eye using the vocabulary provided below. aqueous humor optic nerve cilary body vitreous humor chorold optic disc cornea Iris sclera pupil lens retinaarrow_forwardA 75-year-old woman has right homonymous hemianopia. Identify the likely site of damage in her visual pathway. which one is correct? Optic chiasm Right optic nerve Left optic tract Right optic tractarrow_forwardIdentify the following labels in the diagram of the retina found below. Diagram of a Section of the Eye Total Magnification: 400x B A 0888%0 800000 lightarrow_forward
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