Abstract: An alternating light photometer, the output of which is connected over two parallel uniform current paths with both of the inputs to a differential amplifier. In each of the paths, there is included in series a resistance, a condenser, with a switch provided as well as between a switch and corresponding input of the differential amplifier, and an operational amplifier, all forming a storage circuit. The R C circuit forms a low pass with a time constant over the given engaging or disengaging time of the beam. The switches are so controlled over the switching circuit that only one of them is closed during the time of the complete release, and the other only during the time of the complete interruption of the beam to the photoelectric transducer.

Abstract: A vertical illuminator for imaging a light source at the back aperture of a microscope objective for use in fluorescent microscopy has a light source, an axially-movable positive meniscus lens which has an aspheric convex surface, a positive biconvex lens, and a negative meniscus lens all in sequence and aligned along an optical axis with a beam splitter for introducing light from the source into a microscope observation system. The movable meniscus lens is used to focus an image of the light source at the objective back aperture.

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

Abstract: A pair of spectacles having a lightweight frame structure especially designed with unusual pantoscopic tilt in combination with rocking-pad nasal support affording minimal facial contact and cable temple ends adapted to intimately engage and extend about a large portion of the ear for sureness of continued proper fit of the spectacles upon the face during pursuance of the sport of tennis.

Abstract: Optical sections (lenses) of pseudophakoi having tangential holes are produced without drilling operations. A preform of lens material is drawn with embedded acid soluble rods and/or openings corresponding in diametral size and relative juxtaposition to the size, shape and locations of holes needed in a lens, a lens blank is cut from the drawn preform and portions of rods remaining therein are etched away prior to or following final edging and surface finishing of the lens blank.

Abstract: Ultramicrotomes conventionally use a glass fragment, or fragment of similar material, as a knife. Such knives have the disadvantage of an uneven back surface inherent in the production of such a knife by fragmentation. Using the complementary fragment and mounting the same slightly spaced from the knife back, provides an anti-curl device. A knife holder, having a groove in which the knife fragment is mounted and a pivoted member with a matching slot to hold the anti-curl device, provides positioning of the anti-curl device and provides access to the specimen when the anti-curl device is pivoted out of proximity of the cutting edge.

Abstract: There is provided by the process of the invention a silicate glass which provides protection against mechanical hazards and short and long wavelength ultraviolet radiation while at the same time high transmission of light in the visible range of the spectrum is maintained. By the process of the invention, the incorporation of cerium oxide into the glass followed by ion exchange strengthening using a mixture of potassium salt and silver nitrate provide a synergistic reduction in transmission of light in the ultraviolet range of the spectrum not heretofore obtainable by the use of either cerium oxide or silver staining of the glass alone.

Abstract: A mold for casting contact lenses from an unpolymerized resin such as silicone gum wherein the resin is polymerized by high energy radiation such as an electron beam. One part of the mold is a cap capable of transmitting such radiation. The male section of the mold is gold plated to minimize reaction between the resin and the male section under the influence of the electron beam.

Abstract: A two-element eyepiece having a biconvex singlet with the radii of the convex surfaces being substantially identical and a convex-plano doublet formed of a biconvex element having radii of the convex surfaces being substantially equal with a concavo-plano component cemented thereto, has a field of view of approximately 40.degree. with good correction for normal eyepiece aberrations. Eye relief is approximately 80 percent of the effective focal length.

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: A lens suitable for implantation in the eye is provided with iris clips of wire each having at least one end locked to the lens by an interference fit in an opening in the lens body. A leader of a cross-sectional size freely insertable through the opening is formed upon the wire, inserted through the opening and used to forcefully draw the adjacent full diameter portion of the wire into the lens to produce the interference fit. The leader is cut away and partial retraction of the thus fitted wire can be effected to recess its terminus.