CPO FREE CPO Ocular Emergencies and Triage Questions and Answers — Questions and Answers
Question 1: A patient calls describing symptoms in their right eye that began after a penetrating injury to their left eye two months ago. They report increasing light sensitivity and blurry vision in the right, uninjured eye. Which of the following conditions should be suspected, warranting an immediate referral to an ophthalmologist?
- Traumatic cataract in the left eye
- Sympathetic ophthalmia (Correct answer)
- Corneal abrasion in the right eye
- Post-traumatic stress response
Correct answer: Sympathetic ophthalmia
Sympathetic ophthalmia is a rare, bilateral granulomatous uveitis that can occur after a penetrating injury or surgery to one eye (the 'inciting' eye). The inflammation then develops in the uninjured eye (the 'sympathizing' eye), typically weeks to months later. The symptoms of photophobia and blurred vision in the fellow eye are classic indicators.
Question 2: When triaging a chemical burn, what is the most critical initial action, especially in the case of an alkali burn?
- Applying a neutralizing agent to the eye
- Patching the eye immediately to prevent infection
- Assessing visual acuity before any intervention
- Initiating copious and prolonged irrigation with water or saline (Correct answer)
Correct answer: Initiating copious and prolonged irrigation with water or saline
For any chemical burn, but especially for alkali burns which penetrate ocular tissue rapidly, immediate, copious, and prolonged irrigation is the most critical first step to dilute and remove the chemical. Neutralizing agents can cause further thermal injury and are contraindicated. Assessing vision and patching are secondary to the emergency irrigation that can save sight.
Question 3: A patient presents with a painful, red eye and blurred vision. On examination, a dome-shaped elevation of a posterior ocular layer is suspected. Which feature would most strongly suggest a choroidal detachment over a rhegmatogenous retinal detachment?
- The presence of flashes and floaters
- A history of high myopia
- The elevation is smooth, dome-shaped, and extends anteriorly to the ciliary body (Correct answer)
- The patient reports a 'curtain' falling over their vision
Correct answer: The elevation is smooth, dome-shaped, and extends anteriorly to the ciliary body
Choroidal detachments are characteristically smooth, dome-shaped (convex), and can extend to the ciliary body. In contrast, rhegmatogenous retinal detachments are often more mobile, may have folds, and are attached at the optic disc and ora serrata. While flashes and floaters are classic for retinal detachments, they are less specific. A 'curtain' is also a classic symptom of retinal detachment.
Question 4: Which of the following telephone triage scenarios presents the HIGHEST risk for a retinal tear or detachment and requires the most urgent evaluation?
- A 65-year-old reporting a few new, stable floaters for the past week in both eyes.
- A 30-year-old with a history of migraines reporting jagged, colorful lights in their vision for 20 minutes.
- A 58-year-old myope reporting a sudden onset of hundreds of tiny floaters ('like pepper') and flashes of light in one eye that started 3 hours ago. (Correct answer)
- A 70-year-old pseudophakic patient reporting a single, large, cobweb-like floater that has been present for months.
Correct answer: A 58-year-old myope reporting a sudden onset of hundreds of tiny floaters ('like pepper') and flashes of light in one eye that started 3 hours ago.
A sudden onset of numerous new floaters, often described as a shower or 'pepper', combined with photopsia (flashes) in a myopic patient, represents the highest risk profile for an acute posterior vitreous detachment (PVD) with a concurrent retinal tear. The other scenarios represent lower-risk situations such as a simple PVD, ocular migraine, or chronic, stable floaters.
Question 5: A patient with a history of a scleral buckle procedure for a past retinal detachment presents for a routine check-up. An ultrasound B-scan shows a smooth, convex elevation in the periphery. What finding would help differentiate the scleral buckle from a new choroidal detachment?
- The presence of high reflectivity on the B-scan
- A shadow behind the elevated structure
- The elevation has a fixed, circumferential appearance and lacks after-movement (Correct answer)
- The patient is asymptomatic
Correct answer: The elevation has a fixed, circumferential appearance and lacks after-movement
A scleral buckle is a surgically placed band that indents the sclera. On ultrasound, it appears as a fixed, circumferential structure that does not show the after-movements typical of a fluid-filled choroidal detachment. A shadow can be seen behind the buckle, which helps confirm its solid nature compared to a serous or hemorrhagic choroidal detachment.
Question 6: A patient calls after being hit in the eye with a racquetball. They report significant pain, photophobia, and slightly blurred vision. There is no visible laceration. In this case of blunt trauma, the presence of white blood cells and protein in the anterior chamber, known as traumatic iritis, is a primary concern. What is another urgent condition that MUST be ruled out, often associated with similar symptoms?
- Subconjunctival hemorrhage
- Corneal abrasion
- Angle-recession glaucoma (Correct answer)
- Dry eye syndrome
Correct answer: Angle-recession glaucoma
Blunt trauma can cause damage to the trabecular meshwork in the angle of the eye, leading to angle recession. This damage can impede aqueous outflow and cause a significant, delayed spike in intraocular pressure (angle-recession glaucoma), which is an emergency requiring immediate management to prevent optic nerve damage. While a corneal abrasion and subconjunctival hemorrhage are common, the risk of secondary glaucoma is a more severe, sight-threatening complication that must be urgently assessed.
Question 7: A 68-year-old patient calls describing several episodes of painless, transient monocular vision loss lasting a few minutes, which they describe as a 'curtain falling' over their right eye. Which of the following conditions is the MOST critical to rule out, requiring immediate referral?
- Ocular migraine
- Dry eye syndrome exacerbation
- Giant cell arteritis (GCA) (Correct answer)
- Posterior vitreous detachment
Correct answer: Giant cell arteritis (GCA)
Transient monocular vision loss (amaurosis fugax) in a patient over 60 is a major red flag for Giant Cell Arteritis (GCA), an inflammation of the arteries that can lead to permanent blindness if not treated promptly with systemic steroids. While the other options can cause visual disturbances, GCA is a true ophthalmic emergency requiring immediate action to prevent irreversible vision loss.
Question 8: A patient with known sickle cell trait presents with a Grade 1 traumatic hyphema. The initial intraocular pressure (IOP) is 23 mmHg. What is the most appropriate triage and initial management advice?
- Schedule a follow-up in one week, advising rest.
- Advise over-the-counter pain relievers and a follow-up if it worsens.
- Refer for same-day evaluation due to high risk of IOP spike. (Correct answer)
- Instruct the patient to use a warm compress and monitor at home.
Correct answer: Refer for same-day evaluation due to high risk of IOP spike.
Patients with sickle cell trait are at a significantly higher risk for dangerously elevated intraocular pressure, even with a small hyphema, because sickled red blood cells can obstruct the trabecular meshwork more easily. An IOP over 22 mmHg is already considered elevated, and in this specific population, prompt evaluation and management are critical to prevent glaucomatous optic neuropathy. Standard protocols for hyphema are often accelerated for these patients.
Question 9: A patient calls reporting a sudden, painless 'dome-shaped' shadow in their peripheral vision after recent cataract surgery. They deny flashes of light. Based on this description, which of the following is the MOST likely, though less common, cause?
- Corneal edema
- Choroidal detachment (Correct answer)
- Rhegmatogenous retinal detachment
- Endophthalmitis
Correct answer: Choroidal detachment
While a retinal detachment is a major concern post-operatively, the description of a 'dome-shaped' or convex shadow without preceding flashes is more characteristic of a choroidal detachment. This occurs when fluid accumulates between the choroid and sclera, often related to post-surgical hypotony (low eye pressure). While still urgent, it is a distinct entity from a retinal detachment.
Question 10: An adult patient presents with a sudden onset of horizontal double vision that is worse on right gaze, and their right eye does not fully abduct (turn outward). There is no pain or other neurological symptoms. This isolated finding is most suggestive of a palsy of which cranial nerve?
- Third (Oculomotor) Nerve
- Fourth (Trochlear) Nerve
- Fifth (Trigeminal) Nerve
- Sixth (Abducens) Nerve (Correct answer)
Correct answer: Sixth (Abducens) Nerve
The sixth cranial nerve, or abducens nerve, is solely responsible for innervating the lateral rectus muscle, which abducts the eye (moves it outward). A palsy of this nerve results in an inability to abduct the eye, causing horizontal diplopia that worsens when looking toward the affected side. This is a classic presentation of an isolated sixth nerve palsy.
Question 11: When triaging a chemical burn over the phone, the paraoptometric's most critical initial instruction, which supersedes telling the patient to come in immediately, is to:
- Identify the chemical from its container.
- Keep the affected eye closed and covered.
- Immediately and copiously irrigate the eye with water or saline for at least 15-20 minutes. (Correct answer)
- Apply a neutralizing agent if available.
Correct answer: Immediately and copiously irrigate the eye with water or saline for at least 15-20 minutes.
For chemical burns, immediate and sustained irrigation is the most crucial first step to minimize damage by diluting and washing away the offending agent. This action should begin before the patient even leaves for the clinic. Delaying irrigation to identify the chemical or travel to the office can result in significantly worse ocular surface damage. Neutralizing agents are generally contraindicated as the exothermic reaction can cause further thermal injury.
Question 12: A patient presents with extreme, deep, boring eye pain, proptosis, markedly decreased vision, and an intraocular pressure of 55 mmHg following minor facial trauma an hour ago. The eyelids are very tense. This constellation of signs is a hallmark of which true ocular emergency?
- Acute angle-closure glaucoma
- Orbital Compartment Syndrome (Correct answer)
- Traumatic Uveitis
- Ruptured Globe
Correct answer: Orbital Compartment Syndrome
Orbital Compartment Syndrome (OCS) is a true, time-critical emergency caused by a rapid increase in pressure within the orbit, most often from a retrobulbar hemorrhage after trauma. The key signs are acute proptosis, tense eyelids, very high IOP, and optic nerve compression leading to vision loss. Immediate decompression (lateral canthotomy and cantholysis) is required to prevent permanent blindness, often within 90 minutes of onset.
CPO FREE CPO Ocular Emergencies and Triage Questions and Answers
A patient calls describing symptoms in their right eye that began after a penetrating injury to their left eye two months ago.
They report increasing light sensitivity and blurry vision in the right, uninjured eye.
Which of the following conditions should be suspected, warranting an immediate referral to an ophthalmologist?
What Practice Test Geeks adds beyond an AI chat for CPO
An AI chatbot can quiz you, but it can't reproduce the exam conditions or keep your record. Here you get:
- A timed, full-length CPO mock exam — 120 questions in 90 minutes with a 70% pass mark, modeled on the official exam's question count and time limit, followed by a score report broken down by exam domain.
- A fixed CPO question bank: the same test every attempt, so your score is comparable from one try to the next instead of changing with every regenerated quiz.
- Progress saved on your device: completed tests, scores and missed questions stay in My Progress, so you can retake only what you got wrong.
- A printable CPO cheat sheet you can print or save as a PDF.
- CPO flashcards built from the same question bank.
These practice questions were written with AI tools. They are not real exam questions. Exam facts are checked against the official sources listed below. Not reviewed by a subject-matter expert. Editorial policy
Sources & references
Exam facts on this page (fees, format, dates, passing scores) are checked against these official sources; the date is our last check. Editorial policy