Ophthalmodynamometry

Ophthalmodynamometry (from the Greek. ophthalmos - eyes, dynamis - force metres and " measure") is a method of measuring blood pressure in the blood vessels of the retina. Is held in the ophthalmic examination of patients with essential hypertension, as well as the differential diagnosis of the nature of acute obstruction of the Central artery of a retina (spasm, embolism). Using ophthalmodynamometry; was first proposed by the French ophthalmologist by baharom (R. Bailliart, 1917).
Domestic ophthalmodynamometry (Fig. 1) consists of a graduated scale (disc with two arrows), stick, rod, ending Pugovkina thickening, and an appropriate mechanism that tells the arrows scale displacement is proportional to the pressure exerted by the end of the rod. Before the examination in the eyes of the patient with the aim of anesthesia buried 0.25% solution dikaina. Pugovkina thickening stud ophthalmodynamometry disinfected with alcohol, and then put the eyeball from the outside. Ofthalmoskopia region of the optic nerve while pulling the device on the eyes, marks the inception of pulsation of blood in the Central retinal artery. This is the diastolic pressure. When removing the device from the eyes of one of the displacement in the study arrows scale returns to the zero position, the other indicates the pressure in grams. Measurement of systolic pressure is the same, but press on the eyes to the moment of disappearance ripple artery. In practice, usually limited to measuring only diastolic pressure. For translation of the testimony of ophthalmodynamometry in millimeters of mercury with the influence of intraocular pressure, there is a special table (Fig. 2). At the top of the table horizontally specified pressure in grams, vertically - pressure in millimeters of mercury (as intraocular and blood). Normal pressure in the Central retinal artery, ranges from 30 to 35 mm RT. Art. (diastolic) and from 60 to 70 mm RT. Art. (systolic).

Fig. 2. Table (chart) translation of the testimony of ophthalmodynamometry (pressure in grams) in millimeters of mercury.