ARK-8900 Auto Refractor Keratometer
Joystick-operated refraction and keratometry with automatic measurement, a 5.7-inch color display and thermal printing. Explore ARK-8900 specifications.
Auto Refractors & Keratometers
Auto refractors and autorefractor keratometers support fast objective refraction and, on selected models, corneal curvature measurement. Compare ENOCHTEC configurations for clinics, optical practices and screening workflows.
Buying guide
Auto refractor keratometers: how to choose
An auto refractor keratometer measures the eye’s refractive error objectively and, in K mode, the curvature of the cornea. The results give a starting point for subjective refraction and support contact-lens and pre-operative workflows.
ENOCHTEC offers five models. They differ mainly in how the instrument is aligned (joystick or automatic tracking), the display and connectivity, and whether axial length can be measured.
Compare ENOCHTEC auto refractors
Swipe sideways to compare all models →
| ARK-900 | ARK-8900 | ARK-710 | RMK-8100 | FRS-810 | |
|---|---|---|---|---|---|
| Sphere range | −25.00 to +25.00 D | −25.00 to +22.00 D | −25.00 to +25.00 D | −20.00 to +20.00 D | −25.00 to +25.00 D |
| Alignment | See product page | Joystick, automatic measurement | Automatic eye tracking | Joystick; motorized chinrest | Automatic 3D positioning |
| Display | 6.5-inch LCD | 5.7-inch colour | 9-inch touch, 360° rotation | 9-inch touch | 10.1-inch touch |
| Special functions | FKR keratometry configuration | Corneal diameter 2–12 mm | Bluetooth, auto paper cutting | Hartmann wavefront; RS-232C / LAN / USB | Axial length 11.5–42.0 mm |
| Printer | Built-in thermal | Thermal | Automatic printing | 57 mm thermal | Built-in thermal |
Specifications are taken from each product page. Final configuration, accessories and electrical data are confirmed in the quotation for your destination market.
Questions to answer before you choose
- How many patients per day? Automatic tracking and positioning speed up pre-testing and reduce dependence on operator skill.
- Do you need keratometry? Contact-lens fitting and cataract workflows need corneal curvature; confirm the K configuration.
- Do you run a myopia-management program? The FRS-810 adds axial-length measurement to refraction and keratometry.
- How will results reach your records? Compare printer, Bluetooth, LAN and USB options.
Next steps in the refraction room
Auto phoroptersSubjective refraction
Manual phoroptersSubjective refraction
Visual acuity testingDigital charts
Optometry unitsWorkstations
Planning a complete room? See the refraction room equipment guide.
Auto refractor FAQ
What is the difference between an auto refractor and an autorefractor keratometer?
An auto refractor measures refractive error only. An autorefractor keratometer also measures corneal curvature (keratometry).
Does an auto refractor replace subjective refraction?
No. It provides an objective starting point; the final prescription is refined with a phoropter or trial lenses.
Which model measures axial length?
The FRS-810 combines objective refraction, keratometry and an 11.5–42.0 mm axial-length range in one tabletop instrument.
What minimum pupil size is required?
The ARK-900, ARK-8900, ARK-710 and FRS-810 specify a minimum pupil of 2.0 mm.
Not sure which auto refractor fits your practice?
Tell us your patient volume, workflow and record system. We will recommend a model and send a quotation.
ARK-710 Auto Refractor Keratometer
The ARK-710 combines objective refraction and corneal-curvature measurement with K&R, REF and KRT modes, automatic eye tracking, a 360° rotatable 9-inch touch display, automatic printing and Bluetooth communication.
ARK-900 Auto Refractor Keratometer
ARK-900 tabletop auto refractor keratometer for objective refraction and corneal-curvature measurement, with a 6.5-inch LCD and built-in thermal printer. FR refraction-only and FKR keratometry configurations are confirmed with the quotation.
RMK-8100 Auto Refractometer Keratometer
RMK-8100 auto refractometer keratometer with REF, KER and K&R modes, Hartmann wavefront technology and split-image focusing. Confirm the current configuration.
FRS-810 Auto Refractor Keratometer with Axial Length Measurement
FRS-810 auto refractor keratometer combining objective refraction, corneal measurements and an 11.5–42.0 mm axial-length range in one tabletop workflow.