Sudden Vision Loss: Retinal Pathologies
Ophthalmology High-Yield Examination Essentials
| Condition | Clinical Hallmark | Fundus Appearance |
|---|---|---|
| CRAO | Sudden, painless, severe vision loss. | Cherry-red spot, pale retina, box-carring of vessels. |
| CRVO | Sudden, painless vision loss (often upon waking). | “Blood and thunder” (extensive hemorrhages). |
| CME | Metamorphopsia, central blur. | Flower-petal pattern on fluorescein angiography. |
| CSR | Central scotoma, micropsia. | “Smoke stack” sign on FA; subretinal fluid. |
High-Yield Clinical Pearls
- CRAO Emergency: This is a true ocular stroke. Immediate ocular massage, anterior chamber paracentesis, and systemic management are critical to restore perfusion.
- CRVO Risk: Strongly associated with hypertension, glaucoma, and hypercoagulable states. Ischemic CRVO carries a high risk of neovascular glaucoma (90-day glaucoma).
- CSR (Central Serous Chorioretinopathy): Typically affects “Type A” males under stress. Usually self-limiting, but observation is key. Avoid systemic steroids!
- CME (Cystoid Macular Edema): Most common cause of vision decrease after cataract surgery (Irvine-Gass syndrome).
- Resources: For high-yield clinical vignettes and free study resources, you can always visit mymedschool.org.