Double Vision After Cataract Surgery: Causes, Timeline, and Management

Post-cataract surgery diplopia (double vision) is usually transient but can persist. Understanding causes guides expectations and management.

Common Causes

• Corneal edema: Surgical trauma → stromal swelling → irregular astigmatism → monocular diplopia. Resolves days-weeks with hypertonic drops (NaCl 5%).
• Anisometropia: Refractive difference between eyes (if one eye operated, other cataractous). Brain struggles to fuse images. Resolved by second-eye surgery or contact lens.
• Pre-existing strabismus / phoria decompensation: Cataract blurred vision suppressed deviation; clear vision reveals it. Most common cause of persistent binocular diplopia.
• IOL issues: Decentration, tilt, wrong power, multifocal halos.
• Extraocular muscle trauma: Rare; peribulbar/retrobulbar block or surgical manipulation.
• Posterior capsule opacification (PCO): Late (months-years); YAG capsulotomy fixes.

Timeline and Prognosis

• Days 1–7: Corneal edema, inflammation — common, self-limited.
• Weeks 1–6: Anisometropia, phoria decompensation — may need prism, patching, second surgery.
• >6 weeks: Persistent diplopia warrants full sensorimotor exam, Hess screen, neuro-ophthalmology referral.

Patient Actions

• Use prescribed drops (steroid, antibiotic, lubricant).
• Artificial tears for dryness.
• Avoid heavy lifting/straining (↑ IOP).
• Patch one eye temporarily for comfort (does not harm).
• Follow surgeon’s post-op schedule.

When to Contact Surgeon

• Diplopia not improving by 2–4 weeks.
• New/worsening pain, redness, vision loss.
• Flashes/floaters/curtain (retinal detachment).