JCAHPO Ocular Anatomy & Physiology 2

Question 1

Which photoreceptors are primarily responsible for color vision and function best under photopic (bright light) conditions?

Accepted Answer

Cones

Answer

Cones are concentrated in the macula, contain three types of opsins for color discrimination, and are optimized for bright-light and high-acuity vision.

Question 2

The crystalline lens receives its nutrition primarily from which source?

Accepted Answer

Aqueous humor and vitreous humor

Answer

The avascular crystalline lens is nourished entirely by diffusion of nutrients from the aqueous humor anteriorly and vitreous humor posteriorly.

Question 3

Which layer of the eye is known as the 'uveal tract' and consists of the iris, ciliary body, and choroid?

Accepted Answer

Middle vascular tunic

Answer

The uveal tract is the middle vascular tunic of the eye, comprising the iris, ciliary body, and choroid, providing blood supply to surrounding ocular structures.

Question 4

At the optic chiasm, fibers from which portion of the retina cross to the contralateral optic tract?

Accepted Answer

Nasal retinal fibers

Answer

At the optic chiasm, nasal retinal fibers (which carry temporal visual field information) decussate to the contralateral side, while temporal fibers remain ipsilateral.

Question 5

What is the approximate normal range for adult intraocular pressure (IOP)?

Accepted Answer

10–21 mmHg

Answer

Normal adult IOP is generally considered 10–21 mmHg; pressures consistently above 21 mmHg are a significant risk factor for glaucomatous optic nerve damage.

(JCAHPO) International Joint Commission Allied Health Personnel in Ophthalmology Practice Test

(JCAHPO) International Joint Commission Allied Health Personnel in Ophthalmology Practice Test

JCAHPO Ocular Anatomy & Physiology 2