Abstract: An optical system to permit viewing of adjacent stereoscopic images in which the observers each wear a pair of eyeglasses to view the display. Polarizing light filters are positioned in front of each of the stereoscopic images and these filters have different angles of polarization to encode each image. Each eyepiece includes a polarized filter which decodes the image for its respective eye, and a rotatably adjustable prism which deviates the line of sight a sufficient degree that both stereoscopic images are fused in the fovea of the eye. The rotatably adjustable prism can be a solid prism or a Fresnel prism and Fresnel prisms are preferred. The rotation of the prism permits the observer to adjust the refractory angle of the image regardless of the observer's distance to the image source, and thus permits the observer to move about the displayed images and permits a plurality of observers to view the display.

Abstract: A set of safety goggles (20) for adjustably attenuating the intensity of optical radiation at any selected wavelength produced by a variable-wavelength laser (e.g., a dye laser) comprises a pair of oculars, both of which can be tuned to any particular wavelength producible by the laser. Each ocular comprises a birefringent filter, which includes stationary components including a polarizer (11), a wide-field element made up of a half-wave plate (13) sandwiched between multiwave plates (12 and 14), and a quarter-wave plate (16), and rotatable components including a polarizer (18). The wide-field element causes an optical path difference between orthogonal components of a single polarization state. The quarter-wave plate (15) and the rotatable polarizer (18) in combination enable selection of any particular wavelength whose intensity is to be attenuated.

Abstract: Continuously variable neutral density laser goggles are worn by a user so as to enable the user to align and focus laser beams of specified wavelength. A laser goggles frame has the eye openings adapted to receive filter units therein having three polarized elements, two fixed and one rotatable by an external adjusting lever, that vary in absorbance at the specified wavelength. A connecting rod is connected to each of the adjusting levers so that movement of the connecting rod causes identical movement of the rotatable elements. Additional filter units can be stacked and connected to provide additional absorption when necessary. The user of the goggles firstly maximizes absorption after which the area of concern is observed. The amount of absorption is slowly reduced by moving the connecting rod until the laser radiation is barely visible. Additional filters can be added that eliminate invisible radiation and transmit only visible radiation.

Abstract: A plurality of 3-D glasses are produced by cutting a sheet of material to provide first and second parallel series of eyeglass cutouts therein, each of the series of eyeglass cutouts including first and second eye cutouts, first and second ear cutouts and nose cutouts arranged in respective columns. Continuous strips of red and blue film are placed along preselected columns of eye cutouts. In accordance with a first embodiment, the eyeglass cutouts are separated from one another to provide one ply 3-D glasses. In accordance with a second embodiment, the sheet of material is folded to produce a single series of two ply eyeglass cutouts.

Abstract: The subject of the invention is represented by adjustable luminous intensity sun glasses of the type employing two pairs of polarizing lenses set before one another one pair of which is made up of two identical mobile synchronically rotating lenses which rotate on their axes in respect of the other pair whose lenses are fixed.The two fixed lenses are assembled onto an external frame component, equipped with stems and especially designed dap components relative to the internal side; the set may be adopted as a normal pair of glasses with polarizing lenses. The two mobile lenses are assembled--with the possibility of synchronous rotation around their axes--onto an inside frame component which is equipped with dap seats.

Abstract: An electromagnetic actuator has a motor that indexes an armature element repeatedly by one step from a rest position, and has an electromagnetic clutch coupled with the armature element to increment an optical element that controls light according to relative position. In adjustable polarizing sunglasses, the actuator incrementally rotates a polarized element in each lens in response to the brightness which a sensor receives through the sunglasses. An electrical control circuit compares, in each operating cycle, the sensor signal with high and low reference values to select the motor drive signal.

Abstract: A filter arrangement is described which is incorporated with a night vision device. The filter arrangement consists of a variable density polaroid filter array and a blue-green filter all contained in a common housing and directed along a given optical path. The filter arrangement serves to control the amount of light directed to an input port of a night vision device such as a pair of goggles. In this manner, a user can be trained to employ the night vision device under direct supervision in daylight conditions and by variation of the polarizing plates is enabled to simulate nighttime conditions.

Abstract: Spectacles are provided which comprise lenses having a transparent substrate upon which a continuous transparent metallic layer is vapor deposited. Coated thereover is a continuous layer of a dielectric material which is an odd multiple of one-quarter wavelength of a reference color in thickness.

Abstract: A variable density polarizing attachment for shields combined with spectacles having polarizing lenses is provided along with a method of making variable density shields. A polarizing rotary disc is attached to standard shield adding optionally: polarized eye-protection and/or variable density shading with standard polarized lens' spectacles. The rotary disc is mounted on the inside of the shield and adjacent to standard polarizing spectacles' lenses. By rotating the disc the combination converts the sheidl to variable density. The set of snaps utilized to mount the rotary disc is modified to allow some air inside the shield, and/or to gyrate the disc.

Abstract: Variable density spectacles comprising a pair of superposed iodine stained light polarizing elements, one of such elements being rotatable through an arc of less than 90 degrees to provide changes in the light transmitting functionality of the superposed elements; each of said elements having a light transmittance of from about 42 to 44 percent.

Abstract: An ophthalmic device comprising superposed pairs of light polarizing elements, one pair of such elements being fixed and the other pair being rotatable with respect to the fixed pair to provide a variable light transmission feature. The fixed pair of elements is retained by a frame member having an arcuate peripheral portion which engages a rotatable light polarizing element biasing means which is fixedly attached to each rotatable light polarizing element and prevents substantial axial movement of the rotatable light polarizing element.

Abstract: A variable density polarizing attachment for spectacles having polarizing lenses therein is provided along with a method of making variable density polarizing spectacles. A pair of polarizing lenses are attached to standard spectacles or eyeglasses already having polarizing lenses therein utilizing posts attached to the lenses. The posts are grooved to rotatably hold a polarizing lens adjacent an existing polarizing lens on a pair of spectacles so that existing spectacles can be converted to variable density polarizing spectacles.

Abstract: A side glare device for attachment to a temple-bar of eyeglass frames and similar mounting structures, having a first glare shield member and a second glare shield member with overlapping surfaces for adjustment relative to each other along a common plane to vary the amount of light, and in particular sunlight, transmitted to the eyes of the wearer of the eyeglass frames from a lateral peripheral direction, means for coupling of the first and second members with respect to one another to permit relative positionment of the second member with respect to the first member along the common plane is provided. Means for permitting removable adjustable positional securement of the first member on the temple-bar for maintaining the device at the desired position upon the temple-bar, and means for positionally adjusting the angular orientation of the device with respect to said temple-bar from a raised elevation to a lowered elevation, is also provided.

Abstract: An ophthalmic device comprising superposed pairs of light polarizing elements, one pair of such elements being fixed and the other pair being rotatable with respect to the fixed pair to provide a variable light transmission feature, both immediately adjacent surfaces of the superposed elements comprising a continuous coating of a hydrophobic material.

Abstract: Sunglasses which comprise a unitary frame of flexible material having a front portion adapted to be supported on the nose and open portions adapted to be in front of the eyes and a pair of temples integral with the said front portion and each having an outer depending end portion adapted to pass behind the ear. Each said end portion has a tab removable to provide for the removal of a portion of the end portion nearest the ear to effectively lengthen the temple. A sun screening lens is secured to the front portion of the frame and overlies the open portions.

Abstract: An eyeglass structure for both corrective bifocal lenses and lenses for modifying light intensity wherein means are provided for changing the physical positions of the lenses on the frame to modify the optical characteristics thereof.

Abstract: Automatically operable protective means, e.g. a helmet, for use by welders, has an eye shading means which is brought automatically into shading condition upon reception of light rays or ultrasonic vibrations by a transducer and electromagnetic operator. Provision is made for supplying cooling air to the electronic and electromagnetic devices and to the eye shade, and the shade may incorporate movable polarizing plates for adjustment of transparency.

Abstract: Spectacles having a face-formed readily separable two-section eyeglass frame front wherein a first forward section of the frame front supports a pair of fixed non-circular light-polarizing lenses and a rearward second section supports a rotatable light-polarizing lens in alignment with each forwardly disposed lens. A manually operable rear lens rotating mechanism is provided for selectively rotating the two rearward lenses in unison to simultaneously equally rotationally alter the orientation of axes of polarization of these lenses relative to axes of polarization of the fixed forwardly disposed lenses for correspondingly varying the intensity of light permitted to pass through each system of front and rear lenses of the spectacles.