What's the difference between curvature and ophthalmometer?
Curvature
Definition:
(n.) The act of curving, or the state of being bent or curved; a curving or bending, normal or abnormal, as of a line or surface from a rectilinear direction; a bend; a curve.
(n.) The amount of degree of bending of a mathematical curve, or the tendency at any point to depart from a tangent drawn to the curve at that point.
Example Sentences:
(1) Thirty-three patients with idiopathic scoliotic curvatures underwent metrizamide myelography before surgery from 1979 through 1985.
(2) Experiment 4 measured curvature selectivity as a function of the orientation of a curved adapting grating.
(3) Our analysis showed that the interpolation errors are proportional to the curvature of the dose distribution and are relatively high in regions on either side of, but not including, the steepest part of the penumbra.
(4) The influence of degree of hydration of the monolayers and their spontaneous curvature on conditions of monolayer fusion have been analysed.
(5) The radius of curvature was shorter in the former than in the latter.
(6) This suggests that the curvature of the xenon clearance curve is the result of recording the summation of the activities from the alveoli and the pulmonary blood and not, as previously described, due to the existence of two different sub-populations of alveoli.
(7) A retrospective study was performed to evaluate the effect of recipient-donor trephine disparity on refractive error and corneal curvature post-suture removal in keratoconus.
(8) The top of the fence can also be manipulated in certain ways such as including curvature outward at the top of the fence to make scaling it much more difficult for most.” Some critics, including Washington DC congressional delegate Eleanor Holmes Norton, have warned against excessive fortification, but the report argues: “We recognise all the competing considerations that may go into questions regarding the fence, but believe that protection of the President and the White House must be the higher priority.” “Every additional second of response time provided by a fence that is more difficult to climb makes a material difference in ensuring the President’s safety and protecting the symbol that is the White House.” The panel also urges that a new head of secret service, to replace ousted head Julia Pierson, be brought in from outside the agency, ensuring it is better staffed and trained in future.
(9) The EWRGP group showed a mean flattening in corneal curvature of 0.11 and 0.15 mm in the flattest and steepest corneal meridians, respectively.
(10) This report presents a patient with a tumor of the splenic flexure invading the diaphragm, greater curvature of the stomach, splenic hilum, and tail of the pancreas.
(11) Swimming in the lamprey is accomplished by the generation of a travelling wave of body curvature in which the phase coupling between segments is so controlled as to give approximately one full wavelength on the body at any swimming speed.
(12) Three cases are presented in which a focal concave deformity occurred along the greater curvature of the stomach on upper gastrointestinal (GI) series.
(13) The posterior stabilized total knee prosthesis was introduced as a modification of the total condylar design, changing the center of curvature of the femoral component to allow greater ROM.
(14) This change in shape varied from a slight flattening of the LV and IVS during diastole to total reversal of the normal direction of septal curvature such that the IVS became concave toward the RV and convex toward the LV.
(15) This effect occurs independently in both eyes and it is not due to changes in corneal curvature.
(16) An iterative method is presented which solves for the radius of curvature despite the variation in magnification.
(17) Grating phase had no effect on performance at any curvature or grating frequency, but 16.0-cpd gratings produced a threshold elevation at all curvatures by an average factor of 2.4.
(18) Anomalous positive curvatures in dissolution profiles suggested that calcium bilirubinate initially reduced the surface area available for cholesterol dissolution.
(19) This study presents in detail the exact geometry of scapula anatomy, giving precise figures for distances, angles, and radii of curvature of the scapula.
(20) The normal red cells were biconcave disks in which chlorpromazine induced inward (negative) curvature: deep cupping (stomatocytosis) and multiple invaginations.
Ophthalmometer
Definition:
(n.) An instrument devised by Helmholtz for measuring the size of a reflected image on the convex surface of the cornea and lens of the eye, by which their curvature can be ascertained.
Example Sentences:
(1) Keratometry with the Javal ophthalmometer showed a mean cornea radius of 8.77 mm.
(2) In order to determine the power of intraocular lenses more easily prior to cataract surgery, we compared the results obtained by automatic measurement of the corneal refractive power by the Humphrey Autokeratometer with manually obtained measurements using the Zeiss ophthalmometer.
(3) The refraction of the unilateral aphakic patient has been aided by recent improvements in the ophthalmometer.
(4) We examined 92 normal eyes using Javal Ophthalmometer and Corneal Analysis System (EyeSys) intending to compare the keratometric readings obtained by these two instruments.
(5) The standard was fixated on a face support of ophthalmometers (of the firms "Rodenstock" and "Karl Zeiss") by means of a support providing transference of the standard in two reciprocally perpendicular meridians on the given (5-35) number of grades.
(6) To interpret scale readings below 30 dioptres and over 60 dioptres we compiled an extension table, suited to the ophthalmometer of Javal-Schiøtz (Haag-Streit), making use of low-powered minus and plus auxiliary lenses in front of the tube of the instrument.