The other type of light-sensitive cell in the eye, the rod, has a different response curve.

Even earthworms have light-sensitive cells in their skin which tell them whether it is light or dark.

Although their eyesight is relatively poor, they have light-sensitive cells all over their bodies.

It states that the retina has only two kinds of light-sensitive cells: rods and cones.

The switch from one mechanism to the other is done by the stimulation of three light-sensitive cells between the big compound eyes on their heads.

Swallowtail butterflies also retain light-sensitive cells, this time on their sexual organs.

There are also light-sensitive cells in all bivalves that can detect a shadow falling over the animal.

The retina contains about a million light-sensitive cells.

The disease attacks the retina, the layer of light-sensitive cells at the back of the eye.

Two light-sensitive cells mounted in the pentaprism were arranged to read separate segments of the frame.

There are at least two layers of neurones in the retina, in addition to the light-sensitive cells themselves.

The eyes of blesmols are structurally normal, despite their relatively small size, and include normal light-sensitive cells.

They determine the angles of the Sun by determining which of the light-sensitive cells in the sensor is the most strongly illuminated.

The retina is composed of light-sensitive cells which fire a signal down the optic nerve when light hits the cell.

At the back of the retina lie the light-sensitive cells, so that light must pass through intervening nerve circuitry, getting weakened.

Later animals had deeper cups filled with many light-sensitive cells, until gradually more complex true eyes evolved, and made eye-spots redundant.

Light passing through the cornea is bent so that the rays are focused on the retina, light-sensitive cells inside the eyeball.

Among many-celled animals, various types of worm and some shellfish have a similar arrangement, but the pigment-backed light-sensitive cells are set in a little cup.

The macula is a dense collection of light-sensitive cells in the middle of the retina along the back of the eye.

The light-sensitive cells ( "photocells" ) are not the first thing the light hits, but they are buried inside and facing away from the light.

The many blind people who do entrain to the 24-hour light/dark cycle have eyes with functioning retinas including operative non-visual light-sensitive cells.

The aesthetes consist of light-sensitive cells just below the surface of the shell, although they are not capable of true vision.

Even the simplest organisms have as accurate a body clock as ourselves, sensing light through their cell walls or through special light-sensitive cells.

AMD is a degenerative eye disease in which the light-sensitive cells in the back of the eye, an area called the macula, stop working.

The £120 Buggy, sold by a firm called Economatics, has light-sensitive cells, an infrared receiver, bumpers which sense collisions and a pen holder.