Abstract: A ball falls freely onto an eyelid-covered cornea, and the kinetic energy of the ball is conversed into a force causing deformation of the cornea. The amount of the ball rebound varies depending on the amount of intraocular pressure and the latter is judged against the amount of the ball rebound.An ocular tonometer has a tubular housing, wherein provision is made for a free falling of the ball kept by a special holder at one of the ends of the housing. The opposite end of the housing is placed on the eyelid so that the falling ball interacts with the cornea through the eyelid. The amount of the ball rebound characteristic of the amount of intraocular pressure, is registered either with the aid of a scale or by a special measuring instrument.

Abstract: A ball falls freely onto an eyelid-covered cornea, and the kinetic energy of the ball is conversed into a force causing deformation of the cornea. The amount of the ball rebound varies depending on the amount of intraocular pressure and the latter is judged against the amount of the ball rebound.An ocular tonometer has a tubular housing, wherein provision is made for a free falling of the ball kept by a special holder at one of the ends of the housing. The opposite end of the housing is placed on the eyelid so that the falling ball interacts with the cornea through the eyelid. The amount of the ball rebound characteristic of the amount of intraocular pressure, is registered either with the aid of a scale or by a special measuring instrument.

Abstract: An ophthalmorheographic transducer has a two-layer casing with a space defined between the layers and communicating with a vacuum source. The inner layer is shaped so as to suit the eyeball, is provided with electrodes and has a plurality of openings.

Abstract: An applanation tonometer comprises a housing, a rod accommodated in the housing and carrying a contact disk adapted to interact with the corneal surface in order to exert force thereon, a unit for measuring the force applied to the cornea, a means for registering the instant of time when the diameter of an applanation circle on the corneal surface formed due to the effect of a force applied thereto reaches a preset value, and a recording unit. The registering means is made as a sleeve arranged coaxially with the rod carrying the contact disk and traversably along the rod axis, and a contact set electrically connected to the recording unit and mechanically associated with the traversable sleeve. An additional sleeve is traversable, set coaxially with the traversable sleeve of the registering means, and the end of said additional sleeve is concave-shaped.