Any attempt to formalise visual fields testing in a domiciliary setting is of interest. Most automated perimeters are tied to the practice setting and even those marketed as having a degree of portability can be quite cumbersome. A new portable instrument from Denmark is being launched at this year’s Optrafair and, as well as claiming to offer automated visual field assessment, is also able to assess other indicators of visual function.
Ocusweep
The new Ocusweep (Figure 1), distributed in the UK by Mainline Instruments, is designed to be held by the patient and provides a number of test options. Firstly, it can present a variety of standard optotypes to the patient to allow measurement of acuity for distances of 40cm, 1 and 3 metres. It also incorporates a contrast sensitivity chart. When held at the appropriate distance, the screen offers a number of visual field assessments. It claims to be able to measure the full extent of the visual field and also includes standard automated perimetry equivalent assessments such as 30-2, 24-2 and 10-1.
The manufacturer claims the accuracy holds in ‘normal office lighting conditions.’ Perhaps most interesting of all is the inclusion of tests of a patient’s reaction times. The ‘RTP-test’ is being marketed as aimed at patients working in logistics and with machines and measures their response to a number of targets as they appear.
This may also have some uses when assessing the vision of drivers who, though presenting with adequate acuity, might have some compromised response activity.
I have a number of questions about this interesting kit which, if it does what it claims, should be well worth a look at. I will be arranging a trial in the coming weeks – watch this space.
Further information from, www.main-line.co.uk
