Abstract: Making perforate optical sections (lenses) of pseudophakoi with avoidance of drilling operations and adversities thereof. Lens material is cast over wires corresponding in diametral size and relative juxtaposition to the size and spaced locations of holes needed in a lens and the wires are etched away prior to or following final edging and surface finishing of the lens. The casting of multiple lens preforms is contemplated.

Abstract: 1.

Abstract: A laserable material with a host of non-gaseous, non-periodic atomic structure is provided. The host material is plastic and dispersed in solid solution within the plastic is a chelate of a rate earth metal. The material exhibits narrow-line fluorescence when excited by a high energy light source.

Abstract: A lens suitable for implantation in an aphakic eye is provided with a supporting system useful in positioning the lens in either the posterior or anterior chamber and which accommodates to normal function of a dynamic pupil. The supporting system includes flexible spring-like members structurally designed to follow a dilating and contracting pupil with negligible force against a normally dilated iris diaphragm while providing for automatic centration in the pupil and permanent longitudinal fixation of the lens under normal and extreme conditions of dilation.

Abstract: An ophthalmic glass lens can be prepared by exposing an alkali metal silicate glass to an ion exchange process in which the glass is chemically strengthened by an exchange of potassium ions for sodium ions in the surface layer of the lens at a temperature either above or below the strain point of the glass. The glasses prepared are essentially free of alumina, have adequate strength and substantially increased depth of pentration of the neutral zone even when up to about 6 percent lime is utilized in the preparation of the glass. The effect of lime as a diffusion-retarding agent during the ion exchange process can be overcome (1) by use of an appropriate amount of zinc or magnesium oxide or mixtures thereof so as to maintain an adequate rate of diffusion during ion exchange or (2) by preparation of the glass essentially free of alumina.

Abstract: A plurality of optical glass cores of selected refractive index and dimension are clad with a first glass of lower refractive index providing substantially total internal reflection within the cores. The clad cores are then clad with a glass displaying a lower viscosity than either the core or the first cladding and fused into a final assembly. The cross-sectional area of the second core cladding is selected to provide a minimum free space within the fused assembly.

Abstract: A glass blade is produced from a preform of insoluble glass having a sharp edge encased in soluble glass. The encased preform is heated and drawn to the reduced cross-sectional size desired of the glass blade, cut transversely to length and leached for removal of the soluble glass and exposure of its sharp edge.

Abstract: A conventional pressure cuff is attached to a living test subject. First means are provided for changing pressure in the cuff and thereby applying pressure to the subject. Second means communicating with the cuff are provided for measuring a quantity proportional to a time-dependent fluctuating component representative of pulsatile pressure within a blood vessel of the subject, the second means having a frequency response of at least about five times the subject's pulse rate, whereby the fluctuating quantity is proportional to amplitude of pulsatile pressure. The maximum value of the fluctuating quantity is determined as applied cuff pressure is changed. Third means are provided for determining when the fluctuating quantity is about one-half its maximum value for applied cuff pressure greater than the pressure applied when the maximum value occurred or resulted.

Abstract: A microscope condenser of the Abbe type has the optical characteristics of the biconvex singlet followed by the convex-plano singlet improved by making the first surface of the biconvex singlet aspherical. The aspherical surface substantially reduces spherical aberration and coma as well as pupillary aberration of the condenser.

Abstract: A centrifugal casting mold and mold clamping system adaptable to mass-production technology including a tapered multiple part mold and similarly tapered sleeve within which the assembled mold is insertable for resin filling and centrifuging.

Abstract: A drawing attachment having a focusing system, a power changer system and a telescope, when used in conjunction with an infinity-corrected microscope, permits superimposition of the object viewed through the microscope and a drawing surface for making a drawing of the object being observed. The size of the board is varied by the power changer to permit adjustment of the relative size of the object to the board. The device is designed to be used with an infinity-corrected microscope and is attached to the microscope in the parallel-light zone between the objective and the telescope lens of the microscope.

Abstract: A lens suitable for implantation in the eye is provided with laterally extending iris clips each having at least one of its ends locked within the body of the lens. The clips are initially extended through close-fitting openings, terminally beaded and forcefully retracted sufficiently to bury their beaded ends within the lens body. Cold flow of lens material around the beaded ends locks the clips in place.

Abstract: There is disclosed an ion exchange-strengthened ophthalmic segment glass suitable for the fabrication of fused bifocal and trifocal ophthalmic lenses. More particularly, there is disclosed a lanthanum-silicate based ophthalmic segment glass having indices of refraction of about 1.57 to about 1.65 which is suitable for chemical ion exchange strengthening so as to develop a compressively-stressed ion-exchanged surface layer having a depth of at least 60 micrometers.

Abstract: A microscope illuminator having three lenses with the center lens having an axially-symmetrical aspheric rear surface provides good lateral color correction for illuminated fields to 20mm. when used with a condenser having good color correction.

Abstract: A lens block having locating bosses for fixturing to lens-surfacing equipment and an interconnected oppositely disposed lens holding portion all cast of a eutectic blocking medium. The blocking medium is cast over and through an apertured preform of rigid, relatively high melting temperature material functioning as a heat sink and material filler.

Abstract: A chemically durable, inert optical implant lens and glass composition for the manufacture of same.

Abstract: An ophthalmic glass lens having a compressively stressed surface zone after ion exchanging which is at least 60 micrometers in depth can be formed from an alkali metal oxide silicate glass comprising by weight about 4 to about 15 percent sodium oxide, about 3 to about 15 percent potassium oxide provided the total amount of sodium, potassium and other alkali metal oxides is up to about 20 percent and about 3 to about 15 percent lanthanum oxide. The ion exchange process can take place at a temperature either above or below the strain point of conventional ophthalmic crown glass to produce satisfactory physical properties in the ophthalmic glass lens.

Abstract: The strengthening of a glass ophthalmic lens by ion exchange treatment does not alter the appearance of the lens sufficiently to render the presence or absence of such strengthening readily visually ascertainable even with the aid of a light polarizing strain detector. It being desirable to inspect for the presence or absence of strengthening by ion exchange treatment prior to dispensing glass lenses to the public, the present invention provides an auxiliary device for a light polarizing strain detector with which a lens to be inspected may be immersed in a liquid having approximately the same refractive index as the lens so that the strain detector can produce readily perceivable stress patterns in strengthened lenses.

Abstract: There is disclosed an electrocardiographic review system for displaying ECG data for each of eight patients. Whenever the data for a new patient is to be observed, two trend plots are first displayed on the screen. One of these represents the number of heartbeats per minute and the other represents the number of ectopic beats per minute, the time axis being divided into approximately 240 discrete 1-minute intervals so that the trend data for a 4-hour monitoring period can be displayed. The reviewing physician can move a cursor across the screen to a point of particular interest, for example, to a point along the time axis corresponding to a 1-minute interval during which many ectopic beats were detected. Following this, when a display key in the system is operated, a four-second stationary display of the first ECG waveform of interest which occurred during that 1-minute interval is formed. Thereafter, each operation of the display key controls the display of another 4-second ECG waveform.

Abstract: A two element 10X eyepiece has a field of view of about 44.degree. and provides a wide field (20mm) with lenses having curve-diameter ratios considered desirable from a manufacturing view.