The NIDEK Chart Projector CP-770 is a test chart presenting device which can achieve refraction distance from 2.9 m to 6.1 m. The device is controlled by a wireless remote control or a control box on the refractor (RT).The CP-770 features the following:• Equipped with 33 types of charts (27 types for Type UK) including various kinds of binocular charts• Program function that allows chart presentation with the touch of a button• Versatile masking function that can even offer the display of even a single character• Chart brightness adjustability to the installation conditions• Switchable function between display and non-display of visual acuity of the chart• A long-life LED for the illumination light source
A mains electricity (AC-powered) ophthalmic device intended to project an image on a screen to test visual acuity. The images typically include block letters (Snellen chart) and/or other symbols (e.g., recognizable objects used for children who cannot read) viewed in gradually decreasing size. They are typically identified according to the distance at which they are ordinarily visible (normally 6 metres or 20 feet).
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