Description

We present a case of left-sided sudden visual loss in a 75-year-old man with a previous history of uneventful cataract surgery many years prior. During a car journey home, the patient noticed a sudden drop in vision in the left eye, which he noticed readily having poor vision in the fellow eye due to previous retinal detachment. He presented the next morning to the hospital eye service with painless visual loss. There was no history of trauma. Examination demonstrated a visual acuity of counting fingers in the left eye, and a clear inferior subluxation of the posterior chamber intraocular lens and capsular bag (figure 1).

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Figure 1

Image of inferior subluxation of intraocular lens and capsular bag. Slit lamp view.

The patient was listed urgently for pars plana vitrectomy under a local anaesthetic, with removal of the lens and capsular bag complex, and insertion of an anterior chamber intraocular lens.

Posterior dislocation of an intraocular lens following cataract surgery can present itself as a very late complication many years down the line, with the incidence being as high as 3%.1 The usual mechanism of dislocation is a gradual weakening of the zonular fibres that keep the lens and capsular bag in place. There are frequently predisposing factors with intraocular lens dislocation, including the presence of uveitis, surgical or non-surgical trauma, pseudoexfoliation and, rarely, connective tissue disorders. Management will usually involve either repositioning of the luxated lens, insertion of a sutured posterior chamber intraocular lens or alternatively an anterior chamber lens. The visual prognosis is usually good.2