Which of the following statements about the outer layer of the eye is true?

Correct Answer: C

Rationale: The correct answer is C because the trigeminal (CN V) and the trochlear (CN IV) nerves are indeed stimulated when the outer surface of the eye is stimulated. The trigeminal nerve is responsible for the sensation of touch in the face and controls the muscles involved in chewing. The trochlear nerve controls the superior oblique muscle of the eye, which helps with downward and inward eye movements. Therefore, when the outer layer of the eye is touched or stimulated, these nerves are activated to convey the sensation to the brain. Choices A, B, and D are incorrect: A: The outer layer of the eye is not particularly sensitive to touch compared to other areas like the cornea or conjunctiva. B: The outer layer of the eye is not darkly pigmented; the pigmented layer is actually the uvea inside the eye. D: The visual receptive layer of the eye, known as the retina, is located deeper within the eye, not

Correct Answer: B

Rationale: The correct answer is B: A dark retinal background. This is because individuals of African descent typically have a higher concentration of melanin in their eyes, resulting in a darker retinal background. This can affect the appearance of the fundus during eye examinations. Incorrect choices: A: Increased night vision - Night vision is not directly influenced by melanin levels in the eyes and is more related to the function of rods and cones in the retina. C: Increased photosensitivity - Melanin provides some protection against UV light, so individuals with darker retinas may have lower photosensitivity. D: Narrowed palpebral fissures - Palpebral fissures refer to the opening between the eyelids and are not typically influenced by melanin levels in the eyes.

Correct Answer: A

Rationale: The correct answer is A. Referring the patient to an ophthalmologist or optometrist is the appropriate action because the patient's inability to read the 20/100 line on the Snellen chart suggests significant visual impairment that requires professional evaluation. Options B and C are incorrect as they do not address the underlying cause of the vision issue. Option B focuses on a different method of assessment and does not provide a solution for the patient's visual acuity problem. Option C assumes the patient's vision issue can be corrected by reading glasses, which may not be the case for a 20/100 visual acuity. Option D is also incorrect as it only adjusts the testing distance and does not address the need for a comprehensive evaluation by an eye care specialist.

Correct Answer: B

Rationale: The correct answer is B because people of African descent commonly have a pigmented layer near the outer canthus of the lower lid called the "plica semilunaris." This is a normal anatomical variation in this population. Yellow fatty deposits over the cornea (choice A) are not typical findings in this demographic. Yellow color of the sclera extending up to the iris (choice C) is not a characteristic feature. The presence of small brown macules on the sclera (choice D) is also not a common finding in individuals of African descent.

Correct Answer: D

Rationale: The correct answer is D: convergence of the axes of the eyes. During the accommodation response, the eyes converge to focus on a near object. This is necessary to maintain clear vision when looking at close objects. Dilation of the pupils (A) is not part of the accommodation response. A consensual light reflex (B) refers to both pupils constricting simultaneously in response to light, not specific to accommodation. Conjugate movement of the eyes (C) refers to both eyes moving together in the same direction, which is not the primary action during accommodation.