OFTALMODINAMOMETRIYA (Greek ophthalmos of eyes + dynamis force + metreo to measure, measure) — a method of a hemodynamometry in an orbital artery.
In 1917 P. Bailliart developed theoretical bases of a method and offered the spring device — oftalmodinamometr. Oftalmoskopichesky overseeing by the pulse of the central artery of a retina arising at a compression of an eyeglobe is the cornerstone of a method. Compression load of an eyeglobe causes increase in intraocular pressure (see). When the last reaches the level of diastolic pressure in an orbital artery (on average 45 mm of mercury.), the pulsation in the central artery of a retina appears. Further strengthening of a compression leads to disappearance of a pulsation. At this moment intraocular pressure corresponds to systolic pressure in an orbital artery (on average to 65 mm of mercury.).
The lake is applied to diagnosis various patol, conditions of vessels of a brain, in particular to identification of a cerebral form of an idiopathic hypertensia, and also to diagnosis of disturbances of passability of carotid arteries (a stenosis, thrombosis). To the lake it is contraindicated at hemorrhages on an eyeground, the expressed atherosclerotic changes of intraocular vessels, dystrophy of a retina, inflammatory processes of an eye.
Islands carry out under local anesthesia of an eyeglobe (0,5% solution of Dicainum) and at a mydriasis (1% solution of homatropine). Previously measure the intraocular pressure of the studied eye. Then the platform of a core of an oftalmodinamometr is established on a sclera at the level of an attachment of a lateral direct muscle of an eye. Smoothly and quickly enough press on an eyeglobe and at the same time carry out an oftalmoskopiya of an optic disk, noting the moment of emergence and disappearance of a pulsation of the central artery of the retina characterizing respectively diastolic and systolic pressure in an orbital artery. For transfer of indications of an oftalmodinamometr in indicators of the ABP attach the special gage tables giving the chance to transfer sizes of dynamometer pressure in grams to sizes of the intravascular pressure corresponding to them in millimeters of mercury to an oftalmodinamometr.
During the use of an oftalmodinamometr of P. Bailliart systolic pressure in an orbital artery normal is in limits of 65 — 70 mm of mercury., diastolic pressure is 45 — 50 mm of mercury.
At the correct carrying out O. (taking into account contraindications) complications do not arise. Many researchers are limited to measurement only of diastolic pressure in an orbital artery.
Uyemura (M. of Uyemura, 1955) developed an original method of measurement and graphic registration of pressure in an orbital artery — an oftalmodinamografiya, at a cut by means of an electronic device at the same time eye pulse and size of compression load of an eyeglobe are registered.
Hager (N. of Hager, 1957) offered the technique of an oftalmodinamografiya based on record of orbital pulse at a simultaneous compression of an eye and eye-socket and an oftalmodinamograf of own design.
Devices for an oftalmodinamometriya
On a way of the appendix of compression loading of an oftalmodinamometra are subdivided into two groups. Spring oftalmodinamometra with the mechanical principle of action concern to the first group: oftalmodinamometr Bayara (1917), oftalmodinamometr Sobansky (1936), oftalmodinamometr Müller (1938). Manometrical oftalmodinamometra with use of positive or negative pressure enter into the second group: oftalmodinamometr Kukana (1936), angiotonometr Baurmanna (1951), Van-Boyningena's electrodynamometer (1960).
The broadest use in a wedge, practice was found by spring oftalmodinamometra, is offered ny by P. Bailliart and Müller (N. to Muller).
In the USSR it is used oftalmodinamometr, released by the medikoinstrumentalny plant «Krasnogvardeets», representing a little changed model of an oftalmodinamometr of Bayar (fig., a). A basis of the device are the calibrated spring of compression and the core which is freely moving in the metal cylinder. The rental platform to dia is put on the lower end of a core. 7 mm, contacting to a surface of an eyeglobe. At the movement of a core the plug connected to shooters on a scale of the device with divisions from 0 to 150 g moves (with scale interval of 5 g). By the pressing the platform of a core are set in motion of an arrow — indexes on a scale of the device. After the termination of compression of a spring the core and one of arrows are established in initial situation. The second arrow specifies the size of the received pressure in grams.
It is abroad widespread in the basic of an oft lmo Müller's dynamometer, at to-rogo there is no dial with shooters, and the scale is applied directly on top end of a plunger (fig., b). The device has limits of measurement of 150 and 305 g and is intended for inspection of patients with normal and with the raised ABP.
Manometrical oftalmo dynamometers in the USSR are applied seldom. Abroad in a wedge, practice also the oftalmodinamometra working by the principle of a vacuum compression of an eyeglobe offered by F. Kukan are used.
Bibliography: Bunin A. Ya. Hemodynamics of an eye and methods of its research, M., 1971; The Reference book on ophthalmology, under the editorship of E. S. Avetisov, M., 1978; In an i-1 1 i and of t P. La pression arterielle dans les branches de l'artere centrole de la retine, Ann. Oculist. (Paris), t. 154, p. 648, 1917; Baurmann M. Ein verbes-sertes Dynamometer, Ber. dtsch. Ophthal. Ges., Bd 57, S. 330, 1952; Hager H. Die Anderung der Pulform bei degenera-tiven Gefasserkrankungen, ibid., Bd 61, S. 207, 1958; it she, Die ophthalmo-dynamographie ais Methode zur Beurtei-lung des Gehirnkreislaufes, Klin. Mbl. Augenheilk., Bd 192, S. 827, 1963, Bibliogr.; Muller H. K., Briining A. S o h r H. Ein dynamometer, Ber. dtsch. Ophthal. Ges., Bd 52, S. 434, 1938; Van Beuningen E. Ein pulssynchrones, vollautomatisches Elektro-ophthalmodynamometer, Klin. Mbl. Augenheilk., Bd 137, S. 410, 1960; Weigel i n E.i. L o b s t e i n A. Ophthal-modynamometrie, Basel — N. Y., 1962.
A. Ya. Bunin; S. A. Vinokursky, V. M. Budnik (tekhn.).