Abstract: A converter lens according to an exemplary embodiment of the present invention is a converter lens that has a negative refractive power and increases a focal length of an entire system. The converter lens includes a front group having a positive refractive power and a rear group having a negative refractive power, and the front group is a lens unit having a combined refractive power having a maximum positive refractive power in a case where the combined refractive power is obtained by combining a refractive power of each lens in order from the lens closest to an object toward an image side. At this time, a focal length of the front group, a focal length of the converter lens, and a lateral magnification of the converter lens when the converter lens is disposed on an image side of a master lens are determined as appropriate.

Abstract: Embodiments of the present invention provide a novel and non-obvious method, system and computer program product for the selfie image sourced diagnosis of prospective eye disease. In an embodiment of the invention, a method for diagnosing prospective eye disease includes acquiring a selfie image with a portable communications device, recognizing a portion of the selfie image as an eye and comparing the portion of the selfie image to a pre-stored image of the eye in order to detect a threshold change from the pre-stored image to the selfie image. Thereafter, in response to detecting the threshold change, an alert is displayed in a display of the portable communications device. In this regard, optionally, the threshold change can be classified, and the classification correlated to a prospective ophthalmological diagnosis through the use of a classification table. Then, the prospective ophthalmological diagnosis can be included in the alert.

Abstract: A multi-layer device comprising a first substrate and a first electrically conductive layer on a surface thereof, the first electrically conductive layer having a sheet resistance to the flow of electrical current through the first electrically conductive layer that varies as a function of position.

Abstract: Provided are: a zoom lens including, in order from an object side, a first lens group having positive refractive power, a second lens group having negative refractive power, an Intermediate group having one or more lens groups and having positive refractive power as a whole, a lens group having negative refractive power, and a rear group having one or more lens groups, wherein the intermediate group includes at least two lens surfaces each of which is a cemented surface and is a diverging surface, a space between adjacent lens groups changes in zooming, the lens group moves on an optical axis in focusing, and the zoom lens satisfies the predetermined conditional expression; and an imaging apparatus including the zoom lens.

Abstract: A model eye for calibrating a retinal imaging system is provided including a backplane having a negative radius of curvature R centered on the optical axis and a clear aperture diameter D2; a distance h along the optical axis from the nodal point to the backplane; an unobstructed field of view 2?; a closed fluid fillable housing; a mechanical system for mounting, aligning, and preserving spacings of the elements of the model eye; and a pattern applied to the backplane, the pattern having a rotational symmetry and a radial repeating unit, extending substantially across the clear aperture, that spatially modulates intensity of light reflected from, or transmitted through, a surface of the backplane. D2/D1 is greater than 2, an absolute value of R/h is greater than 0.5, and 2? is greater than zero (0) degrees.

Abstract: A lens barrel includes a plurality of lens groups; a driver configured to move at least part of the plurality of lens groups along an optical axis for focusing; a holder configured to hold the plurality of lens groups and the driver; and a mover configured to move the plurality of lens groups and the driver together along the optical axis by moving the holder along the optical axis. The mover moves the holder to at least a first position at which a shooting distance of the lens barrel is changeable within a first range, and a second position at which the shooting distance of the lens barrel is changeable within a second range. The second range is shorter in minimum shooting distance than the first range.

Abstract: An image lens assembly includes five lens elements, which are, in order from an object side to an image side along an optical path, a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element. The first lens element has positive refractive power. The third lens element has negative refractive power. The fourth lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof and an image-side surface being convex in a paraxial region thereof. The fifth lens element has an object-side surface being convex in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof. The image-side surface of the fifth lens element includes at least one convex critical point in an off-axis region thereof.

Abstract: An imaging lens includes a first lens having positive refractive power; a second lens having positive refractive power; a third lens having negative refractive power; a fourth lens having negative refractive power; a fifth lens; a sixth lens; a seventh lens; an eighth lens; and a ninth lens having negative refractive power, arranged in this order from an object side to an image plane side. The ninth lens is formed in a shape so that a surface thereof on the image plane side has an aspherical shape having an inflection point.

Abstract: Described are various embodiments of process, system and device to automatically adjust user perception of an input, whereby and adjusted image perception value is variably defined for different input locations to create at least one of a multi-focal effect, a progressive perception adjustment, or the like.

Abstract: In an ophthalmic imaging apparatus of some aspect examples, a data acquiring unit acquires data by applying an OCT scan to an eye. An image constructing unit constructs an image from the data acquired. A focal position changing unit is provided to the measurement arm. A scan controller controls the data acquiring unit according to a scan pattern including first and second partial patterns that are continuous patterns for central and peripheral regions of an OCT scan application area, respectively. A focus controller controls the focal position changing unit such that a first focal position is applied in parallel with an OCT scan of at least part of the first partial pattern and a second focal position is applied in parallel with an OCT scan to at least part of the second partial pattern.

Abstract: A display system includes a pixelated display being curved about at least one axis and including a plurality of groups of pixels; a plurality of light redirecting elements where each light redirecting element corresponds to a different group of pixels in the plurality of groups of pixels; and an optical lens system adapted to receive light emitted by the pixelated display and transmitted by the plurality of light redirecting elements. The optical lens system transmits at least a portion of the received light. For at least one pixel in the plurality of groups of pixels, the light redirecting element corresponding to the pixel reduces an angle between a central light ray emitted by the pixel and a chief light ray emitted by the pixel.

Abstract: An optical system (ZL(1)) comprises a plurality of lens groups including a first focusing lens group (G2) and a second focusing lens group (G4) that are disposed side by side on an optical axis, and the second focusing lens group (G4) is disposed at a position closer to an image surface than the first focusing lens group (G2). The first focusing lens group (G2) has positive refractive power, and moves toward an object along the optical axis from focusing on an infinite-distance object to focusing on a short-distance object. The second focusing lens group (G4) moves toward the image surface along the optical axis from focusing on the infinite-distance object to focusing on the short-distance object. The optical system (ZL(1)) satisfies the following conditional expression. ?020<?F1/?F2<0.

Abstract: A variable magnification optical system comprising a plurality of lens groups which includes a first negative lens group having negative refractive power, a second negative lens group disposed at a more image side than the first negative lens group and having negative refractive power, a third negative lens group disposed at a more image side than the second negative lens group and having negative refractive power; upon varying a magnification, distances between adjacent lens groups being varied; the first negative lens group being movable to include a component in a direction perpendicular to the optical axis as a vibration reduction lens group; the second negative lens group being moved along the optical axis upon carrying out focusing; and the predetermined conditional expression(s) being satisfied. The variable magnification optical system can attain a high optical performance and be made in small in size.

Abstract: An optical hybrid lens includes a refractive lens having a curved lens surface, a metalens including at least one metasurface formed on the curved lens surface to follow the curved lens surface of the refractive lens and including a plurality of nanostructures having a shape dimension of a sub-wavelength of incident light, and an adhesive layer between the curved lens surface of the refractive lens and the metalens. The metalens includes at least one metasurface including a plurality of nanostructures having a shape dimension of a sub-wavelength of incident light.

Abstract: Certain embodiments relate to optical devices and methods of fabricating optical devices that pre-treat a sub-layer to enable selective removal of the pre-treated sub-layer and overlying layers. Other embodiments pertain to methods of fabricating an optical device that apply a sacrificial material layer.

Abstract: The present invention provides a wide-angle lens capable of obtaining a suitable negative power even when a thickness of a first lens is increased in order to increase strength against impact. The wide-angle lens 100 has a front group 110, an aperture 80, and a rear group 120. Assuming that a central thickness in an optical axis direction of a first lens 10 is T1 (mm) and a focal length of the entire lens system is f0 (mm), the following conditional expression: 1.500?T1/f0?2.000??Conditional expression (1) is satisfied. Therefore, it is possible to suppress the first lens 10 from being damaged by impact. In addition, it is possible to prevent the first lens 10 from becoming too thick to obtain suitable negative power.

Abstract: An optical system includes, in order from an object side to an image side, a first lens unit consisting of one or more negative lenses, a second lens unit with positive refractive power disposed so as to have a first air space from the first lens unit, and a third lens unit disposed so as to have a second air space from the second lens unit. The first air space is a widest air space of air spaces formed closer to the object side than a positive lens disposed closest to the object side in the optical system. A surface of the first lens unit closest to the image side is concave. The third lens unit consists of a lens element with negative refractive power and having a concave surface on the object side. The optical system satisfies predetermined inequalities.

Abstract: A display apparatus includes a display unit that displays a predetermined target object to be gazed at by a subject, a gaze point detection unit that detects a position of a gaze point of the subject who observes the display unit, a region setting unit that sets a specific region corresponding to the predetermined target object, a determination unit that determines whether the gaze point is present in the specific region, an arithmetic unit that calculates gaze point data on the basis of a determination result of the determination unit, and a display control unit that displays an index at a position corresponding to the gaze point on the display unit if the gaze point data meets a predetermined index display condition.

Abstract: Described are various embodiments of a light field device, optical aberration compensation or simulation rendering method and vision testing system using same. In one embodiment, the device comprises a digital display comprising a set of pixels; an array of light field shaping elements (LFSE) disposed relative to the set of pixels so to at least partially govern a light field emanated thereby; and a digital processor operable to: receive as input one or more higher order aberration parameters digitally defining a higher order aberration; for each given pixel, identify an adjusted image plane location corresponding thereto given a corresponding LFSE corresponding thereto and given said one or more higher order aberration parameters, and associate therewith an adjusted image value designated for the adjusted image location; and render for each said given pixel said adjusted image value associated therewith.

Abstract: Systems and methods automatically locate optical surfaces of an eye and automatically generate surface models of the optical surfaces. A method includes OCT scanning of an eye. Returning portions of a sample beam are processed to locate a point on the optical surface and first locations on the optical surface within a first radial distance of the point. A first surface model of the optical surface is generated based on the location of the point and the first locations. Returning portions of the sample beam are processed so as to detect second locations on the optical surface beyond the first radial distance and within a second radial distance from the point. A second surface model of the optical surface is generated based on the location of the point on the optical surface and the first and second locations on the optical surface.