Table 1
Specifications and features of the two video magnification head mounted devices currently available in the UK (manufacturer/supplier data)
| LVIS | V-max | |
|---|---|---|
| Maximum magnification | ∼10.5× (for distance) | ∼19× |
| ∼15× (for near) | ∼60× as a CCTV | |
| Maximum field of view | ∼50° horizontally | ∼25° horizontally |
| ∼40° vertically | ∼20° vertically | |
| Video display | Binoc (CRT) | Binoc (LCD) |
| Monochromatic | Colour | |
| Vertical display resolution (TV lines) | 250 | 200 |
| Contrast/edge enhancement | yes | yes |
| Contrast reversal | yes | yes |
| Image stabilisation | no | yes |
| Refractive correction | adjust device optics | spectacle prescription worn |
| Headset weight (g) | ∼1133 | ∼651 |
| Approximate cost (£) | 4000 | 3000 |
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↵The LVIS requires auxillary plus lenses in order to achieve maximum magnification at near.
