OCULUS Mesotest II, Инструкция по эксплуатации

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6 Device Description
14 / 86 Instruction Manual Mesotest II (G/62800/0715/en)
Computer/Laptop:
With the examination program „Mesopic vision bin“, you can examine
mesopic vision binocularly.
It consists of 10 test steps.
Test 1 and Test 6: Facilitate the fixation, as here the fixation marks are
displayed
Test 2-5: Are used to test mesopic vision
Test 7-10: Are used to test mesopic vision with glare.
With the examination program „Mesopic vision mono“ (optional with
Mesotest II konkav), you can examine mesopic vision monocularly, for the
right and for the left eye. It consists of 20 test steps.
Test 1, 6, 11 and 16: Facilitate the fixation, as here the fixation marks are
displayed.
Test 2-5 and 12-15: Are used to test mesopic vision
Test 7-10 and 17-20: Are used to test mesopic vision with glare.
5 Landolt rings are presented for each contrast level. The visual
requirement is deemed to be met when the patient has recognised at least
3 of 5 positions of the Landolt ring (60% criterion). Mark this in the
software accordingly
(sec. 10.1.2, page 30) . The results are saved and you
can print them out. You can also compile your own tests.
6.2 Twilight (Mesopic) Vision
Tests for determining mesopic visual acuity and glare contrast sensitivity
were developed, among other things, to test the visual functions that a
driver must have for driving at night.
How do we see in twilight? The transition between daytime (photopic) vision and night (scotopic)
vision is referred to as twilight vision (mesopic vision).
Twilight vision has considerable differences compared to daytime vision.
Daytime vision and cone vision (also known as photopic vision) are the
terms used for luminances greater than 3 cd/m², night vision and rod
vision (also known as scotopic vision) for luminances below 0.03 cd/m² ,
and mesopic vision for luminances in the range between 0.03 and 3 cd/
m².