A 72-year-old woman with a history of previous vitrectomy in the left eye (for rhegmatogenous retinal detachment 5 years ago) now presents with a mature cataract in the same eye. She has no other ocular comorbidities. Preoperative biometry shows keratometry 43.5 D, axial length 24.2 mm, and anterior chamber depth 3.1 mm. During biometry, the IOL Master shows a signal quality of 4/5. What is the most appropriate next step before proceeding to cataract surgery?