A keratometer, also known as an ophthalmometer, is a diagnostic instrument for measuring the curvature of the anterior surface of the cornea, which is used to assess the amount and axis of astigmatism. A very popular and reliable type of manual, one-position keratometer (commonly known as a Bausch and Lombtype keratometer) is shown in Figure 1. Although this type of keratometer rarely goes out ...

PURPOSE To evaluate the accuracy of preoperative keratometers used in cataract surgery with toric intraocular lens (IOL). METHODS Twenty-five eyes received an AcrySof toric IOL implantation. Four different keratometric methods, a manual keratometer, an IOL master, a Pentacam and an auto keratometer, were performed preoperatively in order to evaluate preexisting corneal astigmatism. Difference...

The study was done to compare the corneal curvature readings obtained by Baush and Lomb manual keratometer with that of Nidek autokeratometer ARK-30 to find if either was superior to the other. Curvature of central 3mm corneal zone was measured in horizontal and vertical meridian with Bausch and Lomb manual keratometer and Nidek autokeratometer ARK30 in 67 eyes of 52 patients between the age gr...

PURPOSE To design and evaluate a new infant keratometer that incorporates an unobstructed view of the infant with both eyes (open-field design). METHODS The design of the open-field infant keratometer is presented, and details of its construction are given. The design incorporates a single-ring keratoscope for measurement of corneal astigmatism over a 4-mm region of the cornea and includes a ...

AIM Some surgeons consider hand held surgical keratometers unreliable. This may be due to incorrect use through not realising that the distance that the keratometer is held from the cornea influences the shape of the image. When a keratometer is held closer to the astigmatic cornea, the elliptical image will appear more circular, particularly for larger degrees of astigmatism. However, the kera...

BACKGROUND To establish clinical expectations when using the Lenstar LS 900® dual-zone automated keratometer for surgery planning of toric intraocular lenses. METHODS Fifty eyes were measured with the Lenstar LS 900® dual-zone automated keratometer . Surgical planning was performed with the data from this device and the known surgically induced astigmatism of the surgeon. Post-operative refra...

•Obtaining measurements by the Pentacam HR over time increases variation in measurements. The assessment of interday repeatability is thus importance understanding at which change magnitude a true progression can be suspected.•The Kmax depends on disease and must considered.•The use single, or mean several, when estimating affects common auto-keratometer could helpful assessing more advanced eq...

PURPOSE To evaluate agreement in measurements of astigmatic axis power and location between keratometry and computer assisted videokeratography (corneal topography) on normal corneas with less than 1.50 D of idiopathic astigmatism. METHODS Keratometric readings with the 10 SL/O Zeiss ophthalmometer and corneal topographic maps with the TMS-1 were obtained by two independent examiners on 32 no...

AIMS To evaluate intra- and interobserver variability in measurements on normal and astigmatic corneas with keratometry and computerized videokeratography. METHODS Keratometric readings with the 10 SL/O Zeiss keratometer and topographic maps with the TMS-1 were obtained by two independent examiners on 32 normal and 33 postkeratoplasty corneas. Inter- and intraobserver coefficients of variabil...