A hyphema is a collection of blood inside the front part of the eye (called the anterior chamber, between the cornea and the iris). The blood may cover part or all of the iris (the colored part of the eye) and the pupil, and may partly or totally block vision in that eye. Hyphema is usually caused by trauma to the eye, though other conditions may cause hyphema as well.
Rods and cones in retina: colorized scanning electron micrograph (SEM) of rods and cones, showing the structure of the eye retina. Rods (green) are long nerve cells which respond to dim light, enabling images to be detected. Cones (blue) are shorter cone-like cells which detect colour. Rods and cones pass visual signals through the optic nerve to the brain. Pigment cells block light from passing further. Magnification: unknown.
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