Objective Refraction and Keratometry
The ARK-900 auto refractor keratometer is a tabletop instrument for objective refraction and, in the FKR configuration, corneal-curvature measurement. The paired platform is available as an FR refraction-only version or an FKR version with keratometry. Confirm the selected configuration and supplied accessories in the approved quotation.
Choose the capture method
Three acquisition settings let the operator choose how alignment and measurement are completed.
Assisted alignment
The instrument adjusts the vertical position. Use the joystick to center the eye and focus; measurement starts automatically when alignment conditions are met.
Operator alignment
Position and focus the measuring head with the joystick. The instrument captures the reading automatically once the measurement conditions are met.
Operator-triggered reading
Use the on-screen focus indicators to align the eye, then press the measurement button on the joystick to take the reading.
Vertical tracking assists up-and-down alignment; horizontal positioning and forward/back focusing remain under operator control.
Measure corneal diameter on the recorded image
Capture the eye image, then move the on-screen ruler lines to the corneal edges. The displayed diameter can be reviewed for the right and left eyes.
- Image-based assessment with operator-positioned ruler lines.
- 2.0–12.0 mm range as listed for the FKR configuration.
- Separate right and left eye views for reviewing each recorded image.
Review readings and prepare the printout
Review the examination data on screen and choose the printed information needed for your records.
Individual values and averages
Open the data view to review the measurements taken during the current examination.
- Select 1–10 consecutive measurements in the settings.
- Inspect right/left readings and average values.
- Switch cylinder notation and, on the FKR version, switch between refractive and corneal data.
Configurable thermal reports
The built-in printer supports automatic or manual printing with selectable report content.
- Choose fields such as VD, CYL, PD, patient code, instrument code, date and time.
- Set print density and full-cut or half-cut paper handling.
- Use the recommended 57 mm wide thermal paper.
Questions before choosing a configuration
Does automatic tracking mean fully automatic positioning?
No. Automatic tracking adjusts the measuring head vertically. The operator controls left/right positioning and forward/back focusing with the joystick.
Are corneal measurements included on every version?
No. The FR configuration measures objective refraction. The FKR configuration adds keratometry and the image-based corneal-diameter function.
Can readings be reviewed on screen before printing?
Yes. The data view displays individual readings and average values. Results from the current examination can be reviewed for the right and left eyes, with REF/KRT switching on the FKR configuration.
Can USB, RS232C or Bluetooth be used for general system integration?
USB and RS232C ports are reserved for manufacturer use, as are the Bluetooth and serial settings. General computer or clinic-system integration is not a confirmed function.
What accessories should be included in the quotation?
Confirm the included power cord, thermal paper, cleaning cloth, dust cover, spare fuses, measurement-window dust plug and user manual in your quotation, along with destination-market power requirements.
Measurements support professional refraction assessment and require interpretation by a qualified eye-care professional.
Review more optometry and refraction equipment, or contact ENOCHTEC to confirm the current ARK-900 configuration and supply scope.