A 68-year-old man with type 2 diabetes and hypertension presents with progressive painless vision loss in both eyes over 6 months. Best-corrected visual acuity is 6/24 in both eyes. Slit-lamp examination reveals bilateral nuclear sclerotic cataracts. Dilated fundus examination is normal. The patient is keen for surgery. What is the next step in management?

Explanation

## Clinical Context This patient has bilateral cataracts with visual impairment (6/24 is below the threshold for cataract surgery in most guidelines) and systemic comorbidities (diabetes, hypertension). The key issue is that diabetic patients are at high risk for postoperative visual outcomes being limited by concurrent retinal pathology. ## Why Retinal Assessment is Essential **High-Yield:** In diabetic patients undergoing cataract surgery, preoperative assessment of the macula is mandatory. Diabetic macular edema (DME) or other retinal pathology may coexist and limit the final visual outcome despite successful cataract extraction. **Key Point:** Retinal imaging (OCT or FFA) must be performed BEFORE cataract surgery in all diabetic patients to: - Identify DME or other retinal disease - Set realistic postoperative visual expectations - Determine if additional retinal intervention (anti-VEGF, laser, or steroid) is needed before or after cataract surgery ## Decision Algorithm ```mermaid flowchart TD A[Cataract patient with diabetes]:::outcome --> B{Fundus view adequate?}:::decision B -->|Yes, normal| C[Proceed to cataract surgery]:::action B -->|No, view obscured| D[Retinal imaging: OCT/FFA]:::action D --> E{DME or other pathology?}:::decision E -->|Yes| F[Treat retinal disease first or concurrently]:::action E -->|No| G[Proceed to cataract surgery]:::action ``` **Clinical Pearl:** Even with a "normal" dilated fundus exam, OCT should be performed in diabetics to detect subclinical DME, which is present in ~10% of diabetics without clinically visible retinopathy. ## Why This Patient Needs Retinal Assessment - Dilated fundus exam is subjective and may miss subtle DME - OCT provides objective quantification of macular thickness - Postoperative visual acuity is limited by the worst ocular pathology (cataract + retina) - Diabetic patients have higher rates of postoperative visual dissatisfaction if DME is not identified preoperatively [cite:Ophthalmology textbook on cataract surgery in special populations, standard preoperative workup guidelines]