Practice Test Geeks(JCAHPO) International Joint Commission Allied Health Personnel in Ophthalmology Practice Test
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Ocular Anatomy & Physiology Flashcards

7 cards from real JCAHPO practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Ocular Anatomy & Physiology flashcards as text

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

    Answer: Cones

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

  2. The crystalline lens receives its nutrition primarily from which source?

    Answer: Aqueous humor and vitreous humor

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

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

    Answer: Middle vascular tunic

    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.

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

    Answer: Nasal retinal fibers

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

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

    Answer: 10–21 mmHg

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

  6. The sphincter pupillae muscle, which constricts the pupil, is innervated by which division of the autonomic nervous system?

    Answer: Parasympathetic (cholinergic)

    The sphincter pupillae is innervated by parasympathetic fibers carried via the oculomotor nerve (CN III) and the short ciliary nerves, causing miosis.

  7. The ora serrata marks the boundary between which two structures of the eye?

    Answer: Peripheral retina and pars plana of the ciliary body

    The ora serrata is the anterior margin of the neurosensory retina where it meets the pars plana of the ciliary body, approximately 8 mm posterior to the limbus.