Chapter 50

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Which structure in the eye is responsible for the highest visual acuity?

Lens

Retina (correct)

Ciliary muscle

Optic disc

What is the purpose of the optic disc in the eye?

To provide entry point for retinal blood vessels (correct)

To refract light rays

To connect the ciliary muscle with the lens

To fill the anterior and posterior chambers

What is the refractive index (R.I.)?

The degree of refraction

The speed of light in air

The ratio of speed of light in air to speed of light in a substance (correct)

The speed of light in a transparent substance

Which of the following structures in the eye has the most refractive power?

Lens Signup and view all the answers

What happens to light rays when passing through an angulated interface with a different refractive index?

They bend more Signup and view all the answers

What is the purpose of the suspensory fibers in the eye?

To connect the ciliary muscle with the lens Signup and view all the answers

Which layer of the eye contains the photosensitive cells?

Retina Signup and view all the answers

What is the purpose of the vascular layer in the eye?

To provide entry point for retinal blood vessels Signup and view all the answers

What is the purpose of the suspensory fibers in the eye?

To connect the ciliary muscle with the lens Signup and view all the answers

What type of lens focuses light rays?

Convex lens Signup and view all the answers

Which is the main determinant of the level of pressure in the eye?

Resistance to outflow of aqueous humor Signup and view all the answers

What is the risk factor for glaucoma?

Systemic hypertension Signup and view all the answers

What can increased pressure in the eye cause?

Compression of blood vessels Signup and view all the answers

Which type of glaucoma is the most common in the U.S.?

Open angle glaucoma Signup and view all the answers

What is the main cause of reduced flow through trabecular meshwork in glaucoma?

Deposition of fibrous material Signup and view all the answers

Which type of glaucoma is considered a medical emergency?

Closed angle glaucoma Signup and view all the answers

What is the treatment for closed angle glaucoma?

Laser peripheral iridotomy Signup and view all the answers

Which medication decreases the production of intraocular fluid?

Beta blockers Signup and view all the answers

Which medication increases the outflow of fluid from the eye?

Prostaglandin analogs Signup and view all the answers

Which medication decreases fluid production and increases drainage?

Alpha agonists Signup and view all the answers

Which part of the eye has the highest refractive power?

Anterior surface of the cornea Signup and view all the answers

What is the measure of the power of a lens?

Diopter Signup and view all the answers

What is the total refractive power of the eye?

59 diopters Signup and view all the answers

What is the term for the ability of the lens to increase its refractive power?

Accommodation Signup and view all the answers

What is the condition called when the lens gets harder and less flexible with age?

Presbyopia Signup and view all the answers

What is the term for unequal focusing of light rays due to an oblong shape of the cornea?

Astigmatism Signup and view all the answers

What is the term for farsightedness caused by a short eyeball or sometimes a weak lens?

Hyperopia Signup and view all the answers

What is the term for nearsightedness caused by a long eyeball or sometimes too much refractive power in the lens system?

Myopia Signup and view all the answers

What is the leading cause of blindness worldwide?

Cataracts Signup and view all the answers

What is the term for the ability to see letters of a given size at 20 feet, which is considered normal vision?

20/20 Signup and view all the answers

Chapter 50

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Questions and Answers

Which structure in the eye is responsible for the highest visual acuity?

What is the purpose of the optic disc in the eye?

What is the refractive index (R.I.)?

Which of the following structures in the eye has the most refractive power?

What happens to light rays when passing through an angulated interface with a different refractive index?

What is the purpose of the suspensory fibers in the eye?

Which layer of the eye contains the photosensitive cells?

What is the purpose of the vascular layer in the eye?

What is the purpose of the suspensory fibers in the eye?

What type of lens focuses light rays?

Which is the main determinant of the level of pressure in the eye?

What is the risk factor for glaucoma?

What can increased pressure in the eye cause?

Which type of glaucoma is the most common in the U.S.?

What is the main cause of reduced flow through trabecular meshwork in glaucoma?

Which type of glaucoma is considered a medical emergency?

What is the treatment for closed angle glaucoma?

Which medication decreases the production of intraocular fluid?

Which medication increases the outflow of fluid from the eye?

Which medication decreases fluid production and increases drainage?

Which part of the eye has the highest refractive power?

What is the measure of the power of a lens?

What is the total refractive power of the eye?

What is the term for the ability of the lens to increase its refractive power?

What is the condition called when the lens gets harder and less flexible with age?

What is the term for unequal focusing of light rays due to an oblong shape of the cornea?

What is the term for farsightedness caused by a short eyeball or sometimes a weak lens?

What is the term for nearsightedness caused by a long eyeball or sometimes too much refractive power in the lens system?

What is the leading cause of blindness worldwide?

What is the term for the ability to see letters of a given size at 20 feet, which is considered normal vision?

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