Correct Answer: D

Rationale: The correct answer is D because testing for strabismus by performing the corneal light reflex test is crucial in diagnosing "lazy eye" or amblyopia in children. Strabismus is a condition where the eyes are misaligned, leading to poor vision in one eye. By performing the corneal light reflex test, the nurse can assess if the child's eyes are aligned or if there is deviation, which could indicate lazy eye. Options A, B, and C are incorrect as they do not specifically address the assessment of strabismus, which is the key indicator for lazy eye in this scenario.

Correct Answer: C

Rationale: The correct answer is C: drooping of the upper eyelid. Ptosis refers to the drooping of the upper eyelid, which may occur due to weakened eyelid muscles or nerve damage. In this case, the nurse suspects ptosis in the 60-year-old man, which is likely due to age-related muscle weakness. Choice A, a cloudy cornea, is incorrect as it refers to a different eye condition. Choice B, an unequal red reflex, is incorrect as it is related to abnormalities in the retina. Choice D, protruding and bulging eyes, is incorrect as it indicates exophthalmos, a condition typically seen in thyroid eye disease.

Correct Answer: B

Rationale: The correct answer is B: It is the most common type of glaucoma. Open-angle glaucoma is indeed the most common type, accounting for about 90% of all glaucoma cases. In open-angle glaucoma, the drainage angle of the eye remains open, but the trabecular meshwork becomes blocked over time. This leads to increased intraocular pressure, which can damage the optic nerve and result in vision loss. A, C, and D are incorrect: A: The symptoms mentioned (sensitivity to light, nausea, halos around lights) are more commonly associated with acute angle-closure glaucoma, not open-angle glaucoma. C: Immediate treatment is not necessarily needed for open-angle glaucoma as it progresses slowly, and treatment can vary based on the severity of the condition. D: Vision loss in open-angle glaucoma typically starts with the loss of peripheral vision, not central vision.

Correct Answer: C

Rationale: The correct answer is C because the frontal sinuses are indeed fairly well developed at birth. This is true as the frontal sinuses start developing around the age of 7-8 years but are present in a rudimentary form at birth. This is because the frontal bone grows rapidly in the first few years of life, allowing for the development of the frontal sinuses. Choice A is incorrect because the sphenoid sinuses are not at full size at birth; they continue to develop throughout childhood. Choice B is incorrect as the maxillary sinuses reach full size around the teenage years, not after puberty. Choice D is incorrect as the frontal sinuses are also present at birth, along with the maxillary and ethmoid sinuses.

Correct Answer: A

Rationale: The correct answer is A: otosclerosis. Otosclerosis is a condition where abnormal bone growth in the middle ear causes hearing loss. In this case, the patient's symptoms of progressive hearing loss improving with louder sounds suggest conductive hearing loss, which is commonly seen in otosclerosis. Other choices are incorrect because presbycusis is age-related hearing loss, trauma to the bones would typically result in sudden hearing loss, and frequent ear infections are more likely to cause temporary hearing loss rather than progressive loss.