Leica Keratoscope - Accessory for Leica surgical operating microscope systems

The NIDEK AUTO REF/KERATOMETER ARK-1a/ARK-1 measures spherical, cylindrical refractive errors, and cylinder axis from the refractive status of the patient’s eye. The keratometer measures the corneal curvature radius (corneal refractive power), principal meridian directions, and corneal cylindrical power.

The NIDEK AUTO REF/KERATOMETER ARK-1a/ARK-1 measures spherical, cylindrical refractive errors, and cylinder axis from the refractive status of the patient’s eye.The keratometer measures the corneal curvature radius (corneal refractive power), principal meridian directions, and corneal cylindrical power.

The NIDEK AUTO REF/KERATOMETER ARK-1s measures spherical, cylindrical refractive errors, and cylinder axis from the refractive status of the patient’s eye. In addition, subjective test is performed with the built-in charts and lenses for subjective measurement. The keratometer measures the corneal curvature radius (corneal refractive power), principal meridian directions, and corneal cylindrical power.

The NIDEK AUTO REF/KERATOMETER ARK-1s measures spherical, cylindrical refractive errors, and cylinder axis from the refractive status of the patient’s eye. In addition, subjective test is performed with the built-in charts and lenses for subjective measurement. The keratometer measures the corneal curvature radius (corneal refractive power), principal meridian directions, and corneal cylindrical power.

The AUTO REF/KERATOMETER ARK-F is a medical device which measures objective refractive errors and corneal curvature radius of the patient’s eye. This device also offers retroillumination mode for observing the condition of the ocular media, and measures the amplitude of accommodation.

The NIDEK HANDHELD REF/KERATOMETER, HandyRef-K, measures spherical, cylindrical refractive errors, and cylinder axis from the refractive status of the patient’s eye.The keratometer measures the corneal curvature radius (corneal refractive power) in the steepest and flattest meridian directions, cylinder axis, and corneal cylindrical power.This device is a hand-held model that allows measurement of children who cannot hold their head on the stationary chinrest, bed-ridden patients or patients in an operating room.

The NIDEK refractive power / corneal analyzer OPD-Scan III (hereafter referred to as “the device”) measures objective refractive error, corneal curvature, shape of the anterior corneal surface (topography), and pupil size of the patient’s eye, and analyzes wavefront aberration. The measured refractive error can be used for reference when prescribing corrective lenses such as glasses or contact lenses.

AUTO REF/KERATO/TONOMETER Model TONOREF II is designed to singly perform objective refraction, corneal shape measurement, and non-contact tonometry measurement by incorporating a standard auto ref/keratometer and non-contact tonometer into one unit. The objective refraction function measures spherical powers, cylindrical powers and cylinder axis. The corneal shape measurement function measures the radius of corneal curvature (corneal refractive powers), the direction of the steepest meridian, and the amount of corneal astigmatism. The non-contact tonometry function measures the intraocular pressure without contacting the eye.

The PARK 1 combines three measuring functions in one unit.Auto-RefractometerAn infrared light source projects measuring light onto the retina of the eyefrom where it is reflected back to the shutter location. Sensitive sensorchips, or CCD cameras now register the deviation of the reflected light fromthe shutter location. The deviation depends on the ametropia. From that, anintegrated microcomputer calculates the ametropia in D, based on thesphere, cylinder and cylinder axis position.1 Measuring ocular / Patient eyepiece 4 Chin rest2 Keratometer ring 5 Marking for the eye height3 Pachycam camera glass coverKeratometerTo determine the curvature of the cornea, a reflected image of the corneais captured by a camera sensor and is measured.The reflection of test marks and of a ring is used as the reflected image.This allows the central radii of the cornea to be determined.PachymeterThe pachymetry principle uses Scheimpflug images of the cornea, whichare analysed by a built-in computer.600 Absolute data points are evaluated with the Scheimpflug image. Themeasuring range lies on a 4 mm slit through the apex.The slit light illuminates a sectional plane from the front surface of the corneato the back surface. The transparent cells of the cornea scatter the slitlight such that the sectional plane appears as if it were self-luminous.This is captured at an angle of 45° through the pupil by a camera, wherebythe image plane of the camera is also tilted 45° to the optical axis of thecamera lens, in order to sharply focus the light-scattering cornea planeonto the image plane of the camera (Scheimpflug image).Thanks to this arrangement, sharp sectional images of the cornea can be attained.

IBEX Keratometer is used for measuring the curvature of the anterior surface of the cornea, particularly for assessing the extent and axis of astigmatism.