Biomaterial Database

Dimensional stability of several hard contact lens materials. 1977

R M Pearson

Hard contact lenses of identical specification, but manufactured from different materials, were immersed in water for up to 168 hours. The back central optic radius of each lens was periodically measured. The magnitude and time course of curvature change during hydration were found to vary with the material.

UI	MeSH Term	Description	Entries
D008768	Methylmethacrylates	The methyl esters of methacrylic acid that polymerize easily and are used as tissue cements, dental materials, and absorbent for biological substances.
D011108	Polymers	Compounds formed by the joining of smaller, usually repeating, units linked by covalent bonds. These compounds often form large macromolecules (e.g., BIOPOLYMERS; PLASTICS).	Polymer
D011205	Povidone	A polyvinyl polymer of variable molecular weight; used as suspending and dispersing agent and vehicle for pharmaceuticals; also used as blood volume expander.	Polvidone,Polyvidon,Polyvinylpyrrolidone,Arufil,Bolinan,Bolinan 40,Crospovidone,Dulcilarmes,Duratears Free,Enterodes,Enterodez,Hypotears,Kollidon,Lacophtal,Lacri-Stulln,Lagrifilm,Liquifilm Lagrimas,Nutrivisc,Oculotect,PVP 40,Periston,Plasdone,Polyplasdone XL,Povidone, Unspecified,Protagens,Protagent,Unifluid,Vidirakt S mit PVP,Vidisic PVP Ophtiole,Wet-Comod,Dulcilarme,Enterode,Hypotear,Polyvidons,Protagen,Unspecified Povidone
D002482	Cellulose	A polysaccharide with glucose units linked as in CELLOBIOSE. It is the chief constituent of plant fibers, cotton being the purest natural form of the substance. As a raw material, it forms the basis for many derivatives used in chromatography, ion exchange materials, explosives manufacturing, and pharmaceutical preparations.	Alphacel,Avicel,Heweten,Polyanhydroglucuronic Acid,Rayophane,Sulfite Cellulose,alpha-Cellulose,Acid, Polyanhydroglucuronic,alpha Cellulose
D002627	Chemistry, Physical	The study of CHEMICAL PHENOMENA and processes in terms of the underlying PHYSICAL PHENOMENA and processes.	Physical Chemistry,Chemistries, Physical,Physical Chemistries
D003261	Contact Lenses	Lenses designed to be worn on the front surface of the eyeball. (UMDNS, 1999)	Lenses, Contact,Contact Lens,Lens, Contact
D000042	Absorption	The physical or physiological processes by which substances, tissue, cells, etc. take up or take in other substances or energy.
D013500	Surface Tension	The force acting on the surface of a liquid, tending to minimize the area of the surface. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)	Interfacial Force,Interfacial Tension,Surface Tensions,Tension, Surface,Tensions, Surface
D013997	Time Factors	Elements of limited time intervals, contributing to particular results or situations.	Time Series,Factor, Time,Time Factor
D014867	Water	A clear, odorless, tasteless liquid that is essential for most animal and plant life and is an excellent solvent for many substances. The chemical formula is hydrogen oxide (H2O). (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)	Hydrogen Oxide