Standardization of Visual Acuity
Free logMAR VA Charts for Healthcare
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The Optonet Vision Unit (OVU) allows several repeated measures to be taken quickly, to improve precision.
Letters can be changed randomly infinite times, thus avoiding memorization.
Quick repeated measures also enable to identify the patient’s individual criterion for change to monitor VA changes over time.
The OVU does this automatically, calculating mean and standard deviation.
The Vision Unit offers the option of half steps of letter size changes (0.05 log instead of 1.0 log), to increase accuracy.
Compatibility and Accessibility
It a progressive hybrid web-based app that can be accessed from any computer or tablet and can be displayed on any conventional computer screen.
It offers an easy automated system to record patient’s answers that is faster and minimizes calculation errors.
VA values can be automatically stored in the patient’s file, thus avoiding transcription errors
Modified procedures can easily be adopted to reduce measurement time.
Both, the automated scoring and storing system also reduce measurement time.
Computer screens provide better background luminance and durability than printed charts on illuminated cabinets.
The OVU can be displayed on pre-existing equipment; or the clinic can purchase unexpensive equipment, such as an Android TV device (costing around £50) together with a conventional screen (27” size monitor can be found for just £135). A traditional complete ETDRS system with printed letter charts costs around £1,500; and is not as durable.
Follow the link to activate your Optonet Vision Unit
A regular monitor is all that is required for a high-quality display of Optonet Vision Unit test. Charts for the assessment of binocular vision will require standard red/blue filters* (available under request).
A screen size of around 23” is optimal for clinical practice. However, a larger sized monitor would allow displaying an increased number of lower VA letters at once.
Full HD screen resolution (1920x1080 px) is required for excellent image sharpness; and IPS technology is ideal for high quality contrast sensitivity displays.
Built-in speakers may also be handy, to hear the bleeps that indicate test changes.
Finally, if interested in mounting the monitor on a wall, make sure a VESA system is incorporated.
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