A retinal imager for imaging a retina of an eye includes an illumination source operable to generate illumination light and a beam splitter operable to receive the illumination light and direct the illumination light along an optical axis. The retinal imager also includes a field lens disposed along the optical axis and an objective lens disposed along the optical axis and operable to contact a cornea of the eye. An aerial image is formed adjacent to the field lens. The retinal imager further includes an image sensor and one or more lenses disposed along the optical axis between the beam splitter and the image sensor. The one or more lenses are operable to form a sensor image at the image sensor.

A system and method for a portable eye examination camera is described herein. The system and method may include: a light source disposed within said portable camera at a set distance away from an eye of a patient; a first lens within said portable camera for focusing the light from said light source onto a retina of the eye and providing a wide field retinal image; a second lens for receiving said retinal image and causing a magnification of said retinal image; and a digital camera within a mobile computing device for recording said retinal image.

A hand-held medical device includes a housing, an electronic imager, and an optical system aligned with the electronic imager along an imaging axis of the device. An illumination system includes at least one light source for directing light towards a target of interest, as well as a display connected to the electronic imager and attached to the housing. A processor, disposed within the housing, is connected to the electronic imager, the illumination assembly and the display, and includes processing logic and data storage for storing a plurality of images.

The invention relates to an ophthalmoscope (10) configured to acquire video of an eye. The ophthalmoscope (10) comprises a light source, an imaging apparatus (20), and a processor. The light source emits a beam of non-coherent light which in use impinges on the eye. The imaging apparatus (20) acquires plural images of at least part of the eye, each of the plural images acquired when non-coherent light from the light source impinges on the eye. The processor is configured to at least one of: control the imaging apparatus (20) such that time adjacent images are acquired with a predetermined period therebetween; and record a time of acquisition of each of a plurality of the plural images and to associate each time of acquisition with the respective image. The acquired plural images are thus related in time to one another and thereby constitute video of the eye.

A retina image template matching method is based on the registration and comparison between the images captured with portable low-cost fundus cameras (e.g., a consumer grade camera typically incorporated into a smartphone or tablet computer) and a baseline image. The method solves the challenges posed by registering small and low-quality retinal template images captured with such cameras. Our method combines dimension reduction methods with a mutual information (MI) based image registration technique. In particular, principle components analysis (PCA) and optionally block PCA are used as a dimension reduction method to localize the template image coarsely to the baseline image, then the resulting displacement parameters are used to initialize the MI metric optimization for registration of the template image with the closest region of the baseline image.

Proposed is an ophthalmic lens doublet for indirect ophthalmoscopy. The doublet is cemented into an integral unit from two lens elements, of which is a convex-convex lens element and another is a convex-concave lens element. Both lens elements have external and internal surfaces and may be combined so that the ophthalmic lens doublet has asphericity either on one side or on both sides of the unit. The aspheric surface is characterized by asphericity Z of the following formula (1)

Z=Y.sup.2/{R+[R.sup.2(1+k)Y.sup.2].sup.1/2}(1),

where Z is in one of coordinates in a Cartesian coordinate system, Y is a second coordinate in the Cartesian coordinate system, R and k being variable parameters which are different for each selected values of d, where d is an outer diameter of the ophthalmic lens doublet.

A fundus imaging apparatus includes a scanning optical system, a control circuit, and an image forming unit. The scanning optical system scans a fundus of a subject's eye with light from a light source, and receives return light from the fundus by a light receiver. The control circuit controls the scanning optical system such that a scanning locus is formed by the light in the fundus. The image forming unit forms an image of the fundus based on a light receiving signal from the light receiver and a position of the scanning locus. The control circuit is capable of performing an alignment mode, in which the control circuit controls the scanning optical system to project an alignment indicator for aligning the scanning optical system with the subject's eye on the fundus based on the light from the light source.

Disclosed embodiments may include a device, system and method for providing a low cost device that can measure refractive errors very accurately via attachment to a smart phone. A disclosed device may use ambient light or a light source in simulating the cross cylinder procedure that optometrists use by utilizing the inverse Shack-Hartman technique. The optical device may include an array of lenslets and pinholes that will force the user to effectively focus at different depths. Using an optical device, in conjunction with a smart phone, the user first changes the angle of the axis until he/she sees a cross pattern (the vertical and horizontal lines are equally spaced). The user adjusts the display, typically using the controls on the smartphone, to make the lines come together and overlap, which corresponds to bringing the view into sharp focus, thus determining the appropriate optical prescription for the user.

Disclosed is an electronic apparatus comprising a mounting portion to which one of a plurality of optical heads is selectively mountable; a communicator configured to communicate with an external apparatus; an optical module (optical unit) configured to transmit light, which is reflected from a user's body and passed through the optical head mounted to the mounting portion, to the external apparatus; and a controller configured to obtain identification information about the optical head mounted to the mounting portion when one of the plurality of optical heads is mounted to the mounting portion, and control the communicator to transmit the identification information to the external apparatus.

Thus, a desired optical head is mounted as necessary to capture an image of a user's body part, analyze the captured image, and provide analysis information to a user.

An adapter configured to engage with a hand held computer device to allow a camera on the hand held computer device to take a high quality image of an eye. The adapter allows for high quality imaging of the anterior portion of the eye and the posterior portion of the eye. The adapter can include additional modular components such as an optical pathway enclosure and a beamsplitter module.