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Impressum
Experiences with the Night Vision System NIVIS-2. For which group of patients with tapetoretinal degenerations NIVIS-2 is an appropriate assistance?
Pressmar S. B., Schwartz R., Breidenbach K., Treziak T.
Eye-Clinic, University Hospital Eppendorf, Martinistr. 52, D-20246 Hamburg
Introduction: Due to impaired night vision or night blindness
patients with tapetoretinal degenerations often have to experience a severe
restriction in their mobility. For these patients special Infra-red-Night
Vision (NIVIS-2)-glasses were created. The aim of our study was to evaluate
the benefit of these glasses for patients with various stages of tapetoretinal
degenerations.
Methods: Experiments were performed on 20 patients with tapetoretinal
degenerations of different stages as well as on a control group of 5 healthy
persons. Binocular visual acuity was determined at a sequence of decreasing
levels of illumination for each participant with and without the NIVIS-2-glasses.
Using the Goldmann perimeter, visual fields were evaluated by means of
the testing mark III/4. To obtain an objective parameter for the practical
benefit of the NIVIS-2 glasses, we recorded the time each subject needed
to pass an obstacle course built on an area of 11 x 2,5 m with and without
the NIVIS-2 glasses. The luminance of the obstacle course varied from
1x10-³ to 5x10-³ cd/m².
Results: At a lowered level of illumination (0,3-0,052 cd/m²)
the visual acuity of all patients with a visual field >5º could
be increased by using the NIVIS-2 glasses compared to wearing the best
refraction correction. For the control group an increasing of the visual
acuity by using the NIVIS-2 glasses could be noted at a luminance of 0,02
cd/m² and less. The time needed for the obstacle course could be
reduced on an average of 43,6% for patients with a visual field > 5º
using NIVIS-2 glasses.
Discussion: Patients with tapetoretinal degenerations benefit from
NIVIS-2 in case they still have a sufficient visual field. The threshold
for a sufficient visual field appeared to be > 5º. Consequently,
the NIVIS-2 may help to improve visual rehabilitation in an environment
of reduced illumination.