Describes the current development of a Potential-Stroke Screening Unit to detect persons with high risk of stroke before symptoms develop. Statistics indicate that about 3 out of 4 strokes are due to occlusive lesions usually of the carotid system, particularly in the age group 40 to 60. The pilot screening unit (PSU) combines several diagnostic methods that do not involve any tissue damage, each of which has been proved separately in a research environment. Ophthalmodynamometry (comparing the blood pressure in the ophthalmic artery with systemic and intraocular pressure) detects stenotic and occlusive lesions with 85 to 90 percent reliability, as does thermography, which measures the infrared emission of the forehead. Cervical auscultation (stethoscopy of the neck area) has 85 to 88 percent reliability in detecting the lesions that are both commonest and most amenable to therapy. Flowcharts of the PSU and patient care systems are appended. (Prepared for the XXI International Ophthalmological Congress.) 9 pp. Ref.