Abstract: A component for a mobile computer device, such as a smartphone, can be secured to the housing of the mobile computer device. The component can deflect the light of a built-in light source of the mobile computer device with an optical element and optionally filter the same, or can provide its own light source to improve the option of measuring eccentric photorefraction using the mobile computer device.

Abstract: A component for a mobile computer device, such as a smartphone, can be secured to the housing of the mobile computer device. The component can deflect the light of a built-in light source of the mobile computer device with an optical element and optionally filter the same, or can provide its own light source to improve the option of measuring eccentric photorefraction using the mobile computer device.

Abstract: The current invention is a Photorefractive Flash Device and System. It is a device that can be clipped to any portable computing device to illuminate the pupil in a way, that allows a proper pupillary reflex. On the backside of the device is a photoreceptor, on the frontside—facing the persons eyes are LEDs, centered around an opening where the lens of the camera looks through. A smartphone-app triggers the flashlight of the camera. The photoreceptor of the device senses this flash and triggers the six LEDs to flash sequentially within 200 milliseconds. 200 milliseconds is the time, the pupil needs to react. By staying under this 200 milliseconds, it can achieve high-quality pictures of the pupillary reflection, before the pupil contracts.

Abstract: A component for a mobile computer device, such as a smartphone, can be secured to the housing of the mobile computer device. The component can deflect the light of a built-in light source of the mobile computer device with an optical element and optionally filter the same, or can provide its own light source to improve the option of measuring eccentric photorefraction using the mobile computer device.

Abstract: A component for a mobile computer device, such as a smartphone, can be secured to the housing of the mobile computer device. The component can deflect the light of a built-in light source of the mobile computer device with an optical element and optionally filter the same, or can provide its own light source to improve the option of measuring eccentric photorefraction using the mobile computer device.

Abstract: A retinoscope utilizing a plurality of infrared light sources each positioned at a difference distance, or eccentricity, from the optical axis of a camera is disclosed. The plural light sources are scanned while the fundus reflex is observed. Whether or not a reflex can be detected depends on the defocus of the eye relative to the camera, the pupil size, the eccentricity of the light source from the optical axis, and the camera-to-subject distance. The light sources are preferably light emitting diodes which are flashed repeatedly and sequentially. One-half of the camera aperture is occluded to permit determination of the amount and the direction of defocus. By noting which LED just creates a crescent of light in the pupil, and by measuring the pupil diameter, the relative defocus of the eye is determined.