(n.) A piece of glass, or other transparent substance, ground with two opposite regular surfaces, either both curved, or one curved and the other plane, and commonly used, either singly or combined, in optical instruments, for changing the direction of rays of light, and thus magnifying objects, or otherwise modifying vision. In practice, the curved surfaces are usually spherical, though rarely cylindrical, or of some other figure.
Example Sentences:
(1) These results demonstrate that increased availability of galactose, a high-affinity substrate for the enzyme, leads to increased aldose reductase messenger RNA, which suggests a role for aldose reductase in sugar metabolism in the lens.
(2) Based on several previous studies, which demonstrated that sorbitol accumulation in human red blood cells (RBCs) was a function of ambient glucose concentrations, either in vitro or in vivo, our investigations were conducted to determine if RBC sorbitol accumulation would correlate with sorbitol accumulation in lens and nerve tissue of diabetic rats; the effect of sorbinil in reducing sorbitol levels in lens and nerve tissue of diabetic rats would be reflected by changes in RBC sorbitol; and sorbinil would reduce RBC sorbitol in diabetic man.
(3) The significance of the differences in these two patterns of actin is discussed in terms of differences in the accommodative ability and static lens shape in these two animals.
(4) The epithelium of Brunner's gland stained intensely with Ricinus communis agglutinin-I (RCA-I), succinylated-WGA (S-WGA) and wheat-germ agglutinin (WGA), moderately with Bandeirea simplicifolia agglutinin-I (BS-I), Concanavalia ensiformis agglutinin (Con A) peanut agglutinin (PNA) and Ulex europaeus agglutinin-I (UEA-I) and occasionally with Dolichos biflorus agglutinin (DBA), Lens culinaris agglutinin (LCA) and soybean agglutinin (SBA).
(5) That is, he believes, to look at massively difficult, interlocking problems through too narrow a lens.
(6) The advantages of the incision through the pars plana ciliaris are (1) easier approach to the vitreous cavity, (2) preservation of the crystalline lens and an intact iris, and (3) circumvention of the corneal and chamber angle complications sometimes associated with the transcorneal approach.
(7) The third patient was using an extended-wear soft contact lens for correction of residual myopia.
(8) The cellularity depends on the type of the lens and the material of the lens and on the clinical picture of the disease.
(9) Although lens haemagglutinins were detected in 6 out of 7 rabbits, in only 3 of the 6 animals did the titre reach a maximum of 1:640.
(10) Dioptric aniseikonia was calculated between 1 month and 24 months after surgery (with Gruber's and Huber's computer program) on the basis of most recently obtained values (bulb axis length, depth of the anterior chamber, lens thickness, necessary refraction), and compared with subjective measurements taken with the phase difference haploscope.
(11) We propose that a channel with these properties could contribute to maintenance of lens transparency and fluid balance.
(12) Although the lens did not alter stereopsis, it did produce severe color discrimination losses for normal and dichromatic subjects.
(13) The general efficacy of this intraocular lens compared with other anterior chamber lenses was not addressed in this study.
(14) However, the monkey lens low molecular weight proteins differ from the human low molecular weight proteins in charge as well as molecular weight determined by SDS-PAGE.
(15) Fifty-five myopic naval personnel with no previous contact lens experience were put through a three-week study using these contact lenses.
(16) A Stryker turning frame was used during surgical removal of a posterior displaced lens.
(17) The biocompatibility and fixation of a new silicone intraocular lens was evaluated in the cat eye.
(18) Both organisms have previously been found to be sequestered in the posterior lens capsule by histological and microbiological examination of excised capsular specimens.
(19) Previous experiments had demonstrated that the receptors for the lectins soybean agglutinin (SBA), wheat germ agglutinin, concanavalin A and Lens culinaris agglutinin all were relatively uniformly distributed on both myoblasts and myotubes, and that SBA receptors were capable of rapid redistribution on myotubes but not myoblasts at 4 degrees C (Sawyer & Akeson, 1983).
(20) The relative permittivity and conductivity of rabbit eye lens were measured in the frequency domain between 2 and 18 GHz at temperatures of 37 and 20 degrees C. An analysis of the data suggested that a significant proportion of the bulk water in nuclear and cortical lens tissue may behave differently to pure water.
Optician
Definition:
(a.) One skilled in optics.
(a.) One who deals in optical glasses and instruments.
Example Sentences:
(1) General practitioners initiated referral in 546 cases (49%) and ophthalmic opticians referral in 439 (39%).
(2) The patients were followed by a team consisting of a paediatric ophthalmologist, a contact lens optician and an orthoptist.
(3) In this cataloguq he does not only mention the memorial and prize medals of ophthalmologists but also those of physicists, physiologists, surgeons, opticians who have made a name in the field of ophthalmology.
(4) After examination of the eyes and consultation of an optician, it was decided to measure the animal for a pair of spectacles.
(5) Among the most important landlord firms Southern Cross will have to win over to survive is London & Regional, the investment empire of former optician Ian Livingstone and his chartered surveyor brother Richard.
(6) NHS Nottinghamshire County wants patients to access primary care services via GPs, pharmacists, dentists and opticians and receive "the right care, in the right place, first time".
(7) In looking to the future of optometry and ophthalmology, the author identifies four interacting components--the public, optometrists, ophthalmologists, and eye-health-care manpower, including opticians--which he evaluates.
(8) The paper utilises direct evidence on a number of single modality screening options, including ophthalmoscopy undertaken by general practitioners or ophthalmic opticians, and non-mydriatic photography.
(9) Cosmus Conrad Cuno, a less well known optician and inventor of microscopes from the second half of the 17th century, published in 1734 at Augsburg his Observationes durch dessen verfertigte Microscopia where along with various observations he communicated salient details pertaining to the biology of the head louse.
(10) Seventy patients had glaucoma or incomplete features of glaucoma, all of them referred by ophthalmic opticians.
(11) Until now, low-vision counseling in Switzerland has been provided mainly by opticians and other paramedical personnel.
(12) General practitioners referred many more patients with disorders of the eyelids and adnexa and ophthalmic opticians many more patients with suspected glaucoma.
(13) An empirical section shows that price is 16 percent higher in states that ban optometric and optician price advertising, when examination length, procedures, and office equipment are held constant.
(14) "So we started with hospital comments and then introduced comments on GP practices, and since then we have rolled it out to pretty much every setting: pharmaceutical practices, opticians and walk-in centres.
(15) (A second group of 198 patients with macular degeneration was handled by the optician alone because either macular degeneration was moderate and the patients could manage with simple optical aids, or the patients were in such a bad mental condition, obvious already from the referral documents, that they were unable to use sophisticated aids in spite of the fact that they would have needed them with regard to their poor vision.)
(16) The refractive status of the twin pairs was ascertained by asking the twins to send their latest prescription for glasses to the authors or the refraction was obtained from the ophthalmologists or opticians of the twins.
(17) Students were asked to define the differences among optometrists, ophthalmologists, and opticians.
(18) The results demonstrate that there is a statistically higher prevalence of the majority of acute and also chronic symptoms among dental technicians than among opticians.
(19) The clinical assistants' referral grades formed the reference standard against which to assess the effectiveness of other screening methods including ophthalmoscopy by primary screeners who were general practitioners (GPs), ophthalmic opticians and hospital physicians, and the assessment by consultant ophthalmologists of non-mydriatic Polaroid fundus photography.
(20) During 18 months of follow up new visual and ocular defects among these children were ascertained through ophthalmology outpatients and from optician records.