Fundus Images for the USMLE: Exam Questions and Preparation
How Fundus are tested on the USMLE, the findings to know, a preparation approach and original practice questions with explained answers.
The fundus is the view of the retina seen through an ophthalmoscope, and USMLE questions use it to show systemic disease. The optic disc, the macula and the retinal vessels carry most of the information.
Image-based questions appear on every Step: an ECG tracing, a radiograph, a photograph of the skin, a view of the retina, or a microscopic slide. The skill is the same each time: describe what you see in a fixed order, name the finding, then use it to answer the clinical question. This site does not host exam images, so each finding below is described in words, as many exam stems also do. Practice with an image-rich question bank and the official USMLE sample items to build your pattern recognition. The practice questions here are original and are not real exam items.
How Fundus is tested
Stems describe or show the retina and ask for the diagnosis, the underlying cause or the treatment. Sudden vision loss, diabetes, hypertension and raised intracranial pressure are the common settings.
High-yield topics
- The normal fundus: disc, cup, macula and vessels
- Papilledema and idiopathic intracranial hypertension
- Hypertensive retinopathy: arteriovenous nicking, flame hemorrhages and cotton wool spots
- Diabetic retinopathy: nonproliferative and proliferative disease
- Central retinal artery occlusion and central retinal vein occlusion
- Retinal detachment, age-related macular degeneration and glaucomatous cupping
Preparation approach
- Learn each finding by what it looks like and the disease that causes it, using side-by-side images.
- Separate the painless vision-loss emergencies, since each has a specific next step.
- Link retinal findings to systemic disease: diabetes, hypertension and intracranial pressure.
- Review the screening schedule for diabetic eye disease.
Practice questions
Question 1
A man has sudden, painless loss of vision in one eye. The fundus shows a pale retina with a cherry-red spot at the macula. What is the most likely diagnosis?
- A. Central retinal vein occlusion
- B. Central retinal artery occlusion
- C. Retinal detachment
- D. Vitreous hemorrhage
- E. Optic neuritis
Answer: B. A pale retina with a cherry-red macula indicates central retinal artery occlusion, which is an ophthalmologic and stroke emergency.
Question 2
An obese woman has headaches and bilateral blurring of the optic disc margins. MRI is normal, and the lumbar puncture opening pressure is elevated with normal CSF composition. What is the most appropriate initial treatment?
- A. Acetazolamide and weight loss
- B. Intravenous antibiotics
- C. High-dose methylprednisolone
- D. Observation only
- E. Topical timolol
Answer: A. This is idiopathic intracranial hypertension. Weight loss and acetazolamide are the initial treatment, with surgery for refractory vision loss.
Question 3
A man with long-standing type 1 diabetes has new, abnormal blood vessels on the optic disc and retina. What is the most appropriate treatment?
- A. Tighter blood pressure control only
- B. Panretinal photocoagulation or intravitreal anti-VEGF therapy
- C. Topical antibiotics
- D. Observation
- E. Oral corticosteroids
Answer: B. Neovascularization defines proliferative diabetic retinopathy. Laser panretinal photocoagulation or anti-VEGF injections reduce the risk of vitreous hemorrhage and retinal detachment.
Make it a plan
Add a short daily image block to your study routine. See our Step 1 and Step 2 CK preparation timelines for schedules and weekly milestones. This article is general educational guidance and not an individualized study plan.
Educational content only. Confirm current exam requirements with USMLE.