Welcome to Adaptica Support, we are here to help you. In this section you can find FAQ , Manuals, Guides and hints for 2WIN products. Please complete the form in the Contact tab of this page or e-mail firstname.lastname@example.org with the serial number of your device, the nature of your problem and a description of the test performed.
What are the ideal lighting conditions?
Preferably a room with low lighting, with no light focused directly on the device. Every direct light source should be hidden from the device and should not be visible as a reflection in the patient’s eyes. The space should preferably have no laterally open windows.
Can the device be used outdoors?
No, unless it is in a specially-screened gazebo.
Which position should the patient be in?
The only condition needed for measurement is that the subject is at the correct distance from the device. 2WIN can measure patients sitting, standing or lying down, as the software automatically corrects any inclination of the head.
II. The Device
What is the 2WIN? What principle is it based on?
2WIN is a binocular refractometer that works at 1 m from the patient’s eyes in normal vision conditions. It therefore measures refraction in both eyes at the same time. The binocular function of the device makes it more relaxing, non-irritating and non-invasive for the patient during testing. 2WIN measurement is based on eccentric photorefraction. This technique uses infrared light projected across the patient’s pupils onto the retina. Depending on the refractive error, the reflected light forms a specific increase in luminosity inside the pupil. The spherical reaction is calculated according to the intensity of this increase.
Is 2WIN a portable autorefractomer? Should the results match those of a traditional AR?
Yes, the 2WIN is a portable autorefractometer. However, it is not a traditional AR. The two devices have two different approaches but the results should match (2win is binocular, measures at 1m distance, in more physiologically normal conditions and allows for accommodation).
Are results enough for lens prescription?
No, subjectivity through a phoropter or test glasses is always required (for subjective measurements, use VisionFit SC). However, the 2WIN allows simultaneous binocular refraction during observation in a free space, allowing objective measurement and avoiding the tube effect.
Can I use the device when it is connected to the computer via a USB cable?
No, 2WIN cannot measure refraction when it is connected to a PC via USB. All network services can, however, be used.
How can I update the device and/or install optional applications?
Updates and applications are sent in files and activation codes by e-mail and can be transferred easily to the device’s memory card, in a guided step-by-step process. From version 5.3 there is the OTA update feature.
Can I use an SD card larger than 4GB?
Of course, any MicroSD card can be used to save 2WIN data.
Can I print using any portable WI-FI printer?
Yes, they can be printed on any portable WI-FI printer. It can also be used with any traditional office printer, via PC or MAC, on standard paper, thanks to PDF files produced by the device.
How long does the battery last?
Battery life is not an autonomous variable; it depends on many factors linked to the device’s use. In particular, battery life may vary if WI-FI is used or not, if LEDs and attention sounds are used and according to environmental lighting.
How long can the device remain on standby?
When the device is on, the monitor reduces luminosity after 30 seconds of inactivity and then turns off after another 30 seconds. 2WIN goes into standby mode after 1 minute if WI-FI mode is on and after 10 minutes in normal mode. After 10 mins of standby, the device turns on, emits an acoustic signal and displays a message saying that it will shut down automatically in 30 seconds. Standby before automatic shutdown can be customized. Please note that the rechargeable battery must be charged at least once every 30 days.
What are the ideal pupil dimensions?
Measurements are easier with intermediate pupil dimensions (around 5 mm). 2WIN emits infrared rays all over the eye. When pupil aperture is too small it cannot measure refraction while, on the contrary, when pupil aperture is too large, measurements may be invalidated by aberrations of the corneal periphery.
Can different measurements be found in the same person with 2WIN, even with the same reliability?
Yes. Under the same conditions, measurements should remain within the device’s precision range (precision of measurement for spherical/cylindrical defect: +/- 0.25 D, precision of measurement for cylindrical axis: +/- 5 degree). Variables that influence conditions are those relating to the surrounding environment. A change in luminosity influences the aperture of the pupil. Changes in pupil size can create aberrations that alter ocular refraction.
The human optical system is another extremely important variable and is continually changing. A person may have different refraction in the morning and in the evening, including diopters of difference.
What influence does accommodation have?
Measuring at a distance of 1m, accommodation certainly plays a part. This will clearly be more evident in children than in adults. 2WIN has only a slight accommodation stimulus, leading to partial accommodation in children (the ‘fast’ kind that is normally not corrected with glasses). In adults it is so slight that it can be ignored.
Can measurements be taken during cycloplegia?
Yes. It is better not to wait for the pupil to dilate completely in order to avoid the diameter of the pupil being excessive, leading to aberrations or preventing measurements from being taken.
What happens if the refractive defect is over +-7D?
The device will measure up to 15 Diopters, but in this case it will give only spherical equivalent.
The algorithm automatically decides which is the most reliable measurement to give. It may happen that measurement in range will result in n.a.. This means that the conditions of a good measurement are not reached.
How can one avoid the effect of accommodation?
Accommodation can be reduced by taking a second measurement of the subject, asking them to focus on a target 3-5m behind the operator. As long as the subject’s gaze is near 2win, the operator can ‘detect’ the pupil and obtain a refractive value with a non-accommodating eye.
Can the device be used with patients who wear glasses or contact lenses?
Of course, if you make sure – in the case of glasses – to incline the lenses downwards to avoid a double reflection. There is no problem with contact lenses.
Can children who suffer from nystagmus be measured?
Of course, as long as pupil movement is not excessive and the subject is not clearly cross-eyed.
Can children or adults affected by cataracts be measured?
Depending on the degree of opacity of the crystalline lens, the device may give a degree of reliability that is higher or lower, or may not give any result at all.
Can someone who is excessively cross-eyed be measured?
No. You must take monocular measurements, focusing one eye at a time and covering the other and by asking the patient to look towards the centre of the 2WIN.
Can measurements be taken in the case of loss of an eye?
Of course - in monocular mode.