A 68-year-old man from rural India presents with gradual onset painless vision loss over 2 years. On examination, he has a white opacity in the lens nucleus with a brown discoloration. Visual acuity is 6/60 in both eyes. He is keen for surgery but denies any systemic symptoms. What is the most appropriate next step in management?

Explanation

## Clinical Context This patient has a mature or hypermature nuclear sclerotic cataract (brown discoloration indicates advanced nuclear hardening). He is a suitable surgical candidate with clear indication (VA 6/60 and desire for surgery). ## Next Step in Cataract Surgery Management **Key Point:** Before any cataract surgery, biometry and IOL power calculation are mandatory prerequisites. A-scan (or preferably optical biometry) measures axial length, anterior chamber depth, and keratometry to determine the appropriate IOL power. **High-Yield:** The sequence of pre-operative workup in cataract surgery is: 1. **Biometry** (A-scan/optical biometry) — determines IOL power 2. **Keratometry** — corneal curvature measurement 3. **Anterior segment assessment** — rule out corneal pathology 4. **Posterior segment assessment** — assess retinal/optic nerve health **Clinical Pearl:** In a patient with dense nuclear sclerotic cataract, the posterior segment cannot be adequately visualized clinically. However, if there are no red flags (pain, inflammation, previous ocular surgery), posterior segment imaging (OCT/ultrasound) is deferred until after surgery when the media clears, unless there is specific suspicion of pathology. ## Why Biometry First? Biometry is the rate-limiting step before surgery. Without accurate IOL power calculation, the patient risks significant refractive error post-operatively. This is non-negotiable in modern cataract surgery practice. | Step | Timing | Rationale | |------|--------|----------| | Biometry & IOL calculation | **Before surgery** | Determines surgical outcome refractive error | | Anterior segment assessment | Before surgery | Rule out corneal disease | | Posterior segment imaging | After surgery (if needed) | Dense cataract obscures view; reassess post-op | | Surgery | After biometry complete | Phacoemulsification with IOL implant | **Mnemonic:** **BEFORE** cataract surgery: - **B**iometry (A-scan) - **E**xamine anterior segment - **F**unctional assessment (visual potential) - **O**ptics (IOL power) - **R**etinal status (if visible; else post-op) - **E**xamine for contraindications