Using vision
in the1 real
world
Mary Bairstow VISION 2020 (UK) Ltd
“Sometimes I've believed as many as
six impossible things before breakfast."
Lets try three
• Understanding how to maximise vision
• Getting the best out of optical devices
• Techniques that can help
“That's the reason they're called lessons,
because they lessen from day to day”
Nystagmus – null points and variability
Contrast – optimising use of light
Focus – which spectacles and when
Alice
• Age 7
• Cerebral palsy and nystagmus
• The lesson – Null point , reduced
accommodation, possible field defect
• How Alice learns to lessen……….
I wish I could shut up like a telescope! I
think I could, if I only knew how to begin
• Access to the right equipment
• Basic concepts – focus and
magnification
• Use and flexibility
• Examples
• Pocket lupe – labels and shops
• Hyperocular (high powered
lenses with short focus) – reading
• Telescope – science – observation at
arms length
Images from Eschenbach and Visionenhancers
Lewis
• Age 14
• Congenital Cataracts
• Using stand device, small pocket lupe
and binoculars
• The lesson –No accommodation,
function v form
• How Lewis learns to lessen………
Images from Associated Optical and Visionenhancers
‘‘You may look in front of you, and on
both sides, if you like,' said the Sheep’’
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Basic use and repetitive skills
Eccentric viewing
Haemianopia training
Use of minification in localisation
Use of ‘ghost images 'with prisms
Telescope training – scanning / searching
Carol
• Age 15
• Stargardt’s maculopathy
• Using I pad and mobile phone (oops) +
specs, pocket lupe and telescope
• The lesson – eccentric viewing, telescope
training
• How Carol learns to lessen …….
Images from Eschenbach
“Begin at the beginning and go on till
you come to the end: then stop”
Help a young person use their vision in the real
world by lessening the lesson
• Understanding of how their vision works
• Appreciating use of optical devices
• Being adept in their use
Download

Using vision in the real world (Powerpoint, 1.1 MB)