Anmeldung zur Tagung
Registration
Grußwort
Invitation
Themen
Topics
Allgemeiner Ablauf
General overview
Wissenschaftliches Programm
Scientific program
Kurse
Courses
Symposien
Symposiums
Frühstück mit Spezialisten
Breakfast with specialists
Arzthelferinnen-Fortbildung
Rahmenprogramm
Social program
DOG Information
DOG Information
Allgemeine Informationen
General Information
Autorenindex
Index of Authors
Ausstellerliste
Exhibitors
Sponsoren
Sponsors
Teilnahmegebühren
Registration fees
Impressum
Reading illumination for the partially sighted - Preferred illuminance levels and colours of light. A pilot study
1Lindner H., 1Feyer R.-P., 2Röhl F. W., 1Behrens-Baumann W.
1Universitätsaugenklinik, 2Institut für Biometrie und Medizinische Informatik, Magdeburg
Objective: Subjectively desired illuminance levels and the colour
of light of local reading illumination were determined under care for
partially sighted in the Low Vision Center of the Magdeburg University
Clinic of Ophthalmology.
Methods: A lectern with a near-vision test chart for partially
sighted (Zeiss) was illuminated by a workplace luminaire with provision
for electronic adjustment. The partially sighted were requested to set
what they felt was the optimum illuminance level on the near-vision test
chart. Both near vision and desired magnification were determined at the
illuminance so assessed. In a second experimental section, three test
types of a nearvision test chart (SZB, Switzerland) being equivalent to
a near vision of 0.063 were illuminated with the colours of light of DAYLIGHT
(6000 K), LIGHT WHITE (4000 K) and INTERIOR DESIGN (warm tone; 2700 K)
at an illuminance of 10,000 lux each. The partially sighted were requested
to select that colour of light which they most appreciated. The study
involved 68 partially sighted: 46 females and 22 males. The average age
was 73.5 years, the range being 17 to 93 years. The main groups of eye
diseases diagnosed were: Macular degeneration (38), diabetic retinopathy
or maculopathy (18), optic atrophy (5), opacity of refracting parts (4),
others (high myopia, retinal perfusion disorder; 4).
Results: The desired illuminance levels averaged 10,676 lux, the
range being 1,500 to 23,000 lux. DAYLIGHT colour of light was preferred
by 47% of the partially sighted, LIGHT WHITE by 37%, and INTERIOR DESIGN
(warm tone) by 16%.
Conclusion: Partially sighted prefer very high illuminance levels
to make optimal use of their residual visual power. Such levels can only
be achieved economically by employing special workplace luminaires equipped
with modern compact discharge lamps. Colours of light similar to DAYLIGHT
or LIGHT WHITE are preferred by partially sighted subjects.