| lens pits | The paired depressions formed in the superficial ectoderm of the embryonic head as the lens placodes sink in toward the optic cup; the external openings of the pit's are closed as the lens vesicles are formed. (05 Mar 2000) |
|---|---|
| lens placodes | Paired ectodermal placode's that become invaginated to form the embryonic lens vesicles. Synonym: optic placodes. (05 Mar 2000) |
| lens, simple | <microscopy> A glass disk ground and polished with a spherical figure on one side and a plano, concave, or convex configuration on the other side. (05 Aug 1998) |
| lens stars | Congenital cataracts with opacities along the suture lines of the lens; may be anterior or posterior or both. (05 Mar 2000) |
| lens subluxation | Incomplete rupture of the zonule with the displaced lens remaining behind the pupil. In dislocation, or complete rupture, the lens is displaced forward into the anterior chamber or backward into the vitreous body. When congenital, this condition is known as ectopia lentis. (12 Dec 1998) |
| lens vesicle | In the embryo, the ectodermal invagination that forms opposite the optic cup; it is the primordium of the lens of the eye. Synonym: lenticular vesicle. (05 Mar 2000) |
| lighthouse lens | <physics> A lens built up, progressively, in zones or steps, each zone with its own individual radius. Considerable spherical correction is attained, and the weight of the lens is greatly reduced. Fresnel lenses were originally designed for lighthouses but they are now attainable for small spotlights, automobile headlights, and similar uses. (05 Aug 1998) |
| absorbable surgical suture | A surgical suture material prepared from a substance that can be digested by body tissues and is therefore not permanent; it is available in various diameters and tensile strengths, and can be treated to modify its resistance to absorption and be impregnated with antimicrobial agents. (05 Mar 2000) |
| Albert's suture | A modified Czerny suture, the first row of stitches passing through the entire thickness of the wall of the gut. (05 Mar 2000) |
| apposition suture | A suture of the skin only. Synonym: coaptation suture. (05 Mar 2000) |
| approximation suture | A suture that pulls together the deep tissues. (05 Mar 2000) |
| atraumatic suture | A suture swaged onto the end of an eyeless needle. (05 Mar 2000) |
| blanket suture | A continuous lock-stitch used to approximate the skin of a wound. (05 Mar 2000) |
| bridle suture | A suture passed through the superior rectus muscle to rotate the globe downward in eye surgery. (05 Mar 2000) |
| Bunnell's suture | A method of tenorrhaphy using a pull-out wire affixed to buttons. (05 Mar 2000) |