Abstract: An apparatus for performing an optical test of a sample comprises a receptacle for accepting a specimen slide, at least one illumination element, an optical lens, and image acquisition apparatus, all having fixed positioned relationships relative to said receptacle.

Abstract: A method for testing includes capturing a sequence of video images of a sample comprising semen. The sequence of video images is analyzed by a processor so as to compute and output a motile sperm concentration of the sample.

Abstract: A sample holder includes a slide, containing a depression in a surface of the slide. A cover slip is fixed to the slide over the depression so as to define a sample chamber, while leaving a loading area of the depression uncovered, so that a liquid sample deposited in the loading area is drawn into the sample chamber by capillary action.

Abstract: A method for testing includes capturing a sequence of video images of a sample comprising semen. The sequence of video images is analyzed by a processor so as to compute and output a motile sperm concentration of the sample.

Abstract: A sample holder includes a slide, containing a depression in a surface of the slide. A cover slip is fixed to the slide over the depression so as to define a sample chamber, while leaving a loading area of the depression uncovered, so that a liquid sample deposited in the loading area is drawn into the sample chamber by capillary action.

Abstract: An optical device (22) includes a case (30), which fits over at least a part of a mobile computing device (24) having first and second faces and including a light source (29), which emits a beam of illumination through an exit aperture, and a camera module (27), which captures images through an entrance aperture. Both the entrance and exit apertures open through the second face of the mobile computing device. A receptacle (31) in the case receives and positions a sample (56) in proximity to the second face of the mobile computing device within a field of view of the camera module. Illumination optics (36, 38) receive and turn the beam emitted by the light source so as to back-illuminate the sample while the camera module captures one or more images of the back-illuminated sample.