Cataract surgery is a delicate surgery in ophthalmology, and adequate preoperative examination is required to ensure the surgical results. Pre-operative cataract examination is divided into two parts, namely eye examination and general examination.
Eye examination generally includes: visual acuity, intraocular pressure, ocular A-ultrasound, ocular B-ultrasound, corneal curvature, corneal topography, visual field, fundus and tear duct flushing. The corneal curvature and A-ultrasound are used to calculate the IOL to be implanted during the surgery.
The whole body examination generally includes: blood pressure, blood sugar, electrocardiogram, blood and urine routine, liver and kidney function, etc. The purpose is to understand the patient’s general condition, the presence or absence of hypertension, diabetes and the extent of their condition, and the condition of cardiac function. Generally, blood pressure should be controlled at 140/90 mmHg, fasting blood sugar below 8 mmol/L, and whether the patient can tolerate cataract surgery. If necessary, neurological examination should be performed to understand the cerebrovascular condition.