Lens the clear structure‚ behind the iris and pupil‚ that focuses the light on the retina
(lens = lentil - because of its shape)
Leukocyte white blood cells
(leuco = white; cyto = cell) ...
The lens
The lens is located just behind the iris. It is held in position by zonules extending from an encircling ring of muscle. When this ciliary muscle is ...
Contact lens cleaners
Proteases
To remove proteins on contact lens to prevent infections.
The lens is a transparent, biconvex body, the convexity of its anterior being less than that of its posterior surface.
The optical zoom lens system assists the objective in image magnification. It determines the size of the scan region and the apparent magnification of the image.
Crown glass, a variety of glass, used for making the finest plate or window glass, and consisting essentially of silicate of soda or potash and lime, with no admixture of lead; the convex half of an achromatic lens is composed of crown glass; ...
This new resource, termed DOTS (Database of Transcribed Sequences, builds upon and substantially expands previous work on creating LENS, a database linking information on ESTs generated in the IMAGE/WashU/Merck project.
The lens of each visual unit focuses the image on light sensitive membranes of a small number of photoreceptors within that unit.
To calculate magnification we multiply the power of each lens through which the light from the specimen passes, indicating that product as GGGX, where GGG is the product.
The light of your computer screen then travels onward through the lens. The lens of your eye focuses the light onto a special tissue called the retina. The retina is lined with special photoreceptors called rods and cones.
For example, [your eye] is one of the very best defended tissues-every time you put in a contact lens [from] the holder where it's been festering and the chemicals are old, you probably got a little biofilm on the lens.
Problem 4: Role of the optic vesicle in embryonic lens development
The formation of the lens from the ectoderm layer during frog embryonic development is dependent upon signals received from the underlying optic vesicle This is an example of: ...
Prolonged high blood glucose causes changes in the shape of the lens in the eye, leading to blurred vision and, perhaps, a visit to an optometrist. All unexplained quick changes in eyesight should force a fasting blood glucose test.
magnification - increasing the apparent size of (an object) using a lens or lenses; also refers to increasing concentration of certain chemicals as they pass through a food chain (see biological magnification) ...
In the eye, a nutritive, watery fluid between the cornea and the lens that focuses incoming light rays and maintains the shape of the eyeball.
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z ...
Unlike darkfield, however, this technique requires a specialized microscope objective that includes a "phase annulus" - a ring-shaped coating on one of the lens elements - that must match the incoming cone.
ommatidia The functional units of the invertebrate compound eye, each one of which has a lens, focusing cone, photoreceptive cells, and forms an image.
ommatidium One of the optical units of the compound eye of arthropods.
They have arrived at an image forming eye with a lens which is similar to the eyes of vertebrates. Their eye is an example of convergent evolution since embryonic development of the vertebrate and cephalopod eye are different from one another.
For example, to a botanist working with angiosperms ordinary means might mean a hand lens; to an entomologist working with beetles it might mean a dissecting microscope; ...
(reh-tin-uh) [L. dim. of rete, net]
The innermost layer of the vertebrate eye, containing photoreceptor cells (rods and cones) and neurons; transmits images formed by the lens to the brain via the optic nerve.
retinal ...
compound eye -- Found in many but not all arthropods, a compound eye is composed of a large number of small, closely packed simple eyes (ommatidia), each with its own lens and nerve receptors.
simple eye (ocellus)
a single eye with a single lens found in insects and some other invertebrates.
 See also: Trans, Human, Organ, Cells, Long
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