2WIN-S: the Binocular Stand-alone Vision Screener

Screening Mode available on Kaleidos App!

First and unique device to detect refractive errors and vision abnormalities

2WIN-S is a binocular and portable vision screener that measures the refraction of both eyes and discovers other ocular impairments. The Kaleidos tube serves as a darkroom for the device and allows the exam to be performed in any light condition: while the patient looks inside of it, the system automatically detects refractive errors in less than three seconds. 2WIN-S measures objective refraction in the range of -15D to +15D, and phorias/tropias in prismatic diopters, as well as other additional features.

Complete, clear and sharable exam report

2WIN-S communicates with a tablet through an intuitive app, which can also be used to store and share data with collaborators, colleagues or patients.

Screening mode on Kaleidos App available

This update expands the software’s modes, allowing mass screening tests to be performed quickly, efficiently, and rapidly.

Main Applications

Binocular refraction measurement in natural light conditions.

Refractive errors: myopia, hyperopia, astigmatism and other amblyogenic factors.

Early detection and documentation of multiple amblyogenic factors.

Capable of un-aided binocular refractions.

Detects visual anomalies related to anisometropia, anisocoria, strabismus, and phorias.

Pupil parameters: pupil size, pupil distance and head tilt.

Able to obtain a refraction with different pupil size.

Measurement of dynamic pupils response to programmable light stimulations.

Allows mass screening tests to be performed quickly, efficiently, and rapidly.

Main Benefits

Easy to use

Due to its automated functions, it is easy to use.

Fast and accurate

Extremely fast, accurate and consistent measurements.

Perfect in any light conditions

Entirely independent of environmental light conditions.

Measures automatically

Allows you to delegate measurement to your collaborators.

WiFi printer supported

Enables the operator to share, record, check remotely or print exams.

App based system

Operates using an application on an Android tablet or smartphone.

Technical Information

The perfect start to define the eyes’ necessary correction.


  • Opticians & Optometrists – helps with practice efficiency
  • Ophthalmologists – working with infants, children and getting fast report for adults
  • Pediatricians – can screen infants and children
  • Mission trips – enables large scale screening and exams
  • Corporate Clinics – enables workforce screening
  • Schools – enables mass screenings


  • Binocular Refraction
  • Monocular Refraction
  • Pupil Distance
  • Pupil Size
  • Head Tilt
  • Direction of Gaze
  • Phorias and Tropias


  • Extended measurement range
  • Fully automated
  • Binocular refraction
  • Pupil diameter
  • Dynamic pupilometry
  • Check of lens correction
  • Lens centering on spectacle frames
  • Fully automated and easy to use
  • Operates at 1 m (3’ 3”)
  • Fast measurement
  • Handheld and light weight
  • Battery operated
  • Allows the early detection of refractive errors
  • Ideal with infants, children and non-cooperative patients
  • No drops required
  • Connectable to IR printer
  • Customizable with additional features


  • Android version: 8.0, 8.1, 9, 10, 11, 12, 13
  • Bluetooth Version: 2.0 Low energy
  • Display: 10 inches or more
  • Processor: ARMv7

These are recommended tablet models which were intensively tested with KALEIDOS App:

  • Huawei MediaPad T5 (AGS2-W09)
  • Samsung Tab A6 (SM-T580)
  • Lenovo Tab M10 2nd and 3rd Gen (TB-X605L and TB-328XU)
  • Lenovo Tab M10 HD (TB-X306X)
  • Lenovo Tab M10 Plus 3rd and 3rd Gen 2023 (TB-125FU and TB128FU)


  • Operating mode: binocular/monocular
  • Refraction measurement: automatic
  • Sphere range: ±15 D; in the range ±7 D, step 0.25 D
    from ±7 D to ±15 D, step 0.50 D
  • Cylinder range: ±5 D, step 0.25 D
  • Cylinder axis: 1° – 180°, step 1°
  • Pupil size: auto detection, 4-11 mm, step 0.1 mm
  • Pupil distance: auto detection, 30-120 mm, step 0.1 mm
  • Fixation target: built-in
  • Acoustic target: built-in
  • Measurement: patient – operator distance > 1 m
  • Hygienic disposable masks: included
  • Data interface: Wi-Fi, internal microSD card
  • Printer interface: Wi-Fi and email printing
  • User interface: Android application for Bluetooth tablets, providing remote control, live streaming, data management
  • Power: rechargeable battery pack, 50 Wh
  • Total size (cm): 130 x 32 x 21.5
  • Tube size (cm): 119 x 23 x 15
  • Metal stand size (cm): 45 x 32 x 21,5
  • Max height operation system: 130 cm
  • Net weight: 5,5 kg
  • Battery charge: AC/DC medical power supply 18 V, 40 W

Manuals Download

All the information you need to use our device at its best.

2WIN-S allows simultaneous evaluation of refraction and binocular cooperation of subjects in natural (without cycloplegia) and not dissociating conditions, as opposite to autorefractometers, which only work monocularly.

Dr. Mario Angi

To detect and correct Amblyopia Children in America, children in Europe and children even in
remote parts of the World can benefit from photo screening with the device like 2WIN-S.

Dr. Robert Arnold
Pediatric Ophthalmologist & Surgeon

Subscribe to our email Newsletter

Subscribe to our email newsletter for useful tips, special promotions and valuable resources.