vertical meridian marker, Indicates the vertical axis or helps identify the meridional position being measured., axis scale, Shows the angular position (in degrees) of the meridian being measured, Rotating grip for locating the axis, Rotates the instrument to align the mires with the principal meridians of the cornea, eye piece, Focuses the internal reticle (crosshairs/mires) for the examiner’s eye to ensure accurate readings, Vertical measuring drum, Adjusts the size of the mire image along the vertical meridian, Horizontal measuring drum, Adjusts the size of the mire image along the horizontal meridian, focusing knob, Moves the entire instrument forward/backward to bring the cornea into focus and aligns the instrument with the patient’s eye., locking knob, Secures the instrument in position after alignment to prevent drifting during measurement., Chin rest elevation knob, Raises or lowers the chin rest to align the patient’s eye with the eyepiece., elevating knob, Moves the instrument up/down to align it with the patient's eye level., chin rest, Supports the patient’s chin to keep the head stable., leveling sight, A small bubble level that helps ensure the instrument is horizontally aligned to avoid skewed readings., Head rest, Stabilizes the patient’s forehead and helps prevent backward movement., Occluder, Blocks the non-tested eye from interfering with the measurement or to prevent fixation shift.

keratometer functions

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