Description
What’s Included
- Righton Retinomax K-Plus 3 handheld autorefractor/keratometer main unit
- Power cable
- Carrying case
- Built-in printer
- Charging station
- 90-day Digital Eye Center warranty
Note: per the source listing, the unit comes with a power cable, case, printer, and charging station. No additional accessories beyond what is photographed are included.
Condition & Warranty
Used. Tested in excellent working order, ready to use once received — no additional steps needed. Item has been cleaned. Some signs of usage are visible in the product photos. Refraction and keratometry output verified, charging station and battery confirmed functional. Covered by a 90-day warranty on parts and workmanship.
Retinomax K-Plus 3 — Used Handheld Auto Ref/Keratometer
The Righton Retinomax K-Plus 3 is the handheld autorefractor and keratometer of choice for clinicians who need objective refraction and corneal curvature on patients who can’t sit at a table-mounted unit. This used retinomax k-plus 3 arrives inspected, calibrated, and ready for clinical use, with a 90-day warranty backing it.
Each measurement takes 0.35 seconds for refraction alone, or 0.45 seconds for combined refraction plus central and peripheral keratometry. The K-Plus 3 stores 100 patient records on-device and is roughly 17% lighter than earlier Retinomax generations — the difference is felt within the first hour of a school screening or NICU round.
Per a National Library of Medicine-indexed study (Journal of AAPOS, 2019), the Retinomax handheld platform produces refraction values that correlate closely with photoscreener-class devices in pediatric populations — making it a clinical workhorse for pre-verbal and screening contexts where a phoropter isn’t possible.
Why Practices Choose the Retinomax K-Plus 3
Combined refraction + keratometry — one device captures sphere, cylinder, axis, and central keratometry in a single workflow rather than two separate instruments.- 0.35-second measurement — fast enough to capture readings on uncooperative children and dementia patients before they look away.
- Peripheral keratometry at 2.5 mm — four-point tangential measurement at 25° gives information for contact-lens fitting that table-mounted units don’t always provide.
- Quick mode (0.07 sec) — auto-engages after six idle seconds so capture is near-instant when you find a clear pupil.
- 100 patient memory — review and print on demand without re-measuring.
- 17% lighter than earlier Retinomax models — under one kilogram with battery, which matters across a 50-screening day.
- Pupil size measurement — captured automatically and printed alongside the refraction values.
Clinical Applications
- Pediatric and preschool vision screening — schools, NICU, well-baby visits
- Patients in wheelchairs or unable to position at a table-mounted autorefractor
- Mobile clinics, outreach programs, and surgical waiting-area refraction
- Refraction in dementia or special-needs populations where cooperation is limited
- Contact lens fitting that benefits from peripheral K readings
- Backup unit for high-volume practices when the primary table-mounted ARK is in use or down
Who This Is For
- Pediatric ophthalmology and optometry practices doing daily preschool refractions
- Mobile vision screening providers running school programs
- General optometry practices that need a portable backup to their table-mounted ARK
- Hospitals and surgical centers needing chairside refraction in pre-op or recovery
Technical Specifications
| Spec | Detail |
| Type | Handheld autorefractor + keratometer |
| Refraction time | 0.35 sec per reading |
| Refraction + central + peripheral K | 0.45 sec per reading |
| Quick mode time | 0.07 sec (auto-engages after 6 idle sec) |
| Peripheral keratometry | 2.5 mm zone, 4-point tangential at 25° |
| Patient memory | 100 records on-device |
| Pupil size | Auto-measured, printed |
| Weight | Under 1 kg with battery |
| Power | Rechargeable battery + AC adapter |
| Output | Built-in thermal printer |
| Condition | Used — inspected, calibrated |
| Warranty | 90 days (parts and workmanship) |
Compare Handheld Refraction Options
| Feature | Retinomax K-Plus 3 (this listing) | Retinomax K-Plus 5 | Vision Screener Digital Eye | Nidek ARK-560A (table) |
| Form factor | Handheld | Handheld | Handheld pediatric screener | Table-mounted |
| Refraction | Yes (sphere, cyl, axis) | Yes | Auto-screening (refers to ARK) | Yes (full) |
| Keratometry | Central + peripheral | Central + peripheral | No | Central |
| Speed per reading | 0.35 sec | 0.07 sec quick mode | ~1 sec both eyes | ~1–2 sec |
| Best use case | Mobile, pediatric, special-needs | High-volume mobile | School / pediatric screening | Routine in-office |
| Condition / Warranty | Used / 90 days | Used / 90 days | New / 1 year | Used / 90 days |
| Price | $6,600 | $8,800 | $4,590 | $4,400 |
Need the newer model with charging station and faster operation? See the Retinomax K-Plus 5. Looking for a pediatric-screener-class device instead of a full handheld ARK? Compare with the Vision Screener Digital Eye.
Questions about the Retinomax K-Plus 3? Contact us for battery condition, accessory compatibility, and freight quote — call 305-771-4562 or use the contact form.
