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Vision Impairment

Vision Impairment. Some things to note:. Being registered blind does not mean that you cannot see (very few people see absolutely nothing) Less than 5% of people who are registered blind, can use Braille. Many use large print or tape recorders to access / record information. Normal vision.

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Vision Impairment

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  1. Vision Impairment

  2. Some things to note: • Being registered blind does not mean that you cannot see (very few people see absolutely nothing) • Less than 5% of people who are registered blind, can use Braille. Many use large print or tape recorders to access / record information

  3. Normal vision

  4. Blurred vision The most common problem. Some people’s vision is so blurred that it is often impossible to distinguish features or text without some kind of support.

  5. Colour Perception Another common visual problem is colour perception. Here you can see that everyday objects, such as the drink on the table, become difficult to identify.

  6. Tunnel Vision Here you can see that the central vision is unaffected, but the peripheral vision is poor. This view can often make people sea-sick and cause them to bump in to things

  7. Peripheral Vision In this example you can see that the central vision is the only area affected. This type of view can often mean that the individual needs to move around, or tilt their head to seethings clearly.

  8. Blind Spots These may be permanent in location, or mobile = Floaters. They can affect the entire visual field and are often the most difficult to accommodate. Conditions such as Glaucoma can cause blind spots.

  9. Severe Impairment This is an example of a colleague’s vision. He has only slight vision in one corner of the left eye. Even this vision is blurred.

  10. What Can help for moderate difficulties?? Glasses and Contact Lenses Magnifying Glass

  11. Lighting • Individuals can be photosensitive or experience photophobia as part of their visual impairment, whilst others benefit from additional light sources. • Different styles of lighting can be a factor, e.g. fluorescent (overhead strip-style), tungsten (standard light bulbs), halogen (used in spot lights and concealed lighting), coloured lamps / daylight bulbs. • Health and Safety issues within the work place or public area may mean that an individual’s lighting preferences cannot be implemented

  12. Monitor Options • TFT versus CRT • Size of monitor can also be important • Larger screen view: An 18” TFT screen may give a picture size the same as a 19” or 20” CRT • Clearer screen view for some users = less light reflection • Quicker refresh rate so more stable image • Duller image Changing a 15” screen to a 21” screen produces a 1½ times magnification without doing anything else!

  13. Some Basics! • Bring the screen monitor to user • Keep the screen clean • Move the screen to a position of less glare • Know how to adjust the brightness and contrast • Adjust lighting around monitor • Keep it simple, reduce the clutter

  14. Tweaking the Computer!

  15. Desktop Schemes • Changing the colour scheme within Windows can make the text easier to read • Schemes may be selected from a list or fully customised for each user

  16. Example Desktop Schemes

  17. Screen Resolution – size of screen contents 1024 x 768 800 x 600

  18. Mouse Pointer / Cursor • Built-in options allow the user to change the: • Size • Colour • Style Free Mouse Pointers / Cursors: http://www.dolphinuk.co.uk/downloads/cursors.htm http://www.ace-centre.org.uk/html/software/cursors/cursors1.html

  19. Ways of locating the Mouse Pointer: • Trails • Target

  20. Within applications: Zoom, Wrap to Windows and BackGround Colours

  21. Customising Toolbars • Customising the toolbars can remove the unused toolbars • as well increasing the size of the text area.

  22. Keytop Stickers or KidGlove overlay • Special Keyboards, e.g. BigKeys, Intellikeys • Key style – uppercase versus lowercase • Key layout: ABC versus QWERTY • Key Size

  23. WEB difficulties faced by people with Visual Impairment & Colour-Blindness: • Poor colour contrast for text/background • Colour alone used to convey information • Numerous and Unclear Serif fonts used • Font sizes definitions fixed • Inconsistent & cluttered layout • Graphics without text description (ALT TAGS)

  24. Browser Adjustments – Text Size

  25. Browser Adjustments – Colour Preferences

  26. Browser Adjustments – Accessibility Options

  27. Practical Session • Display Options • Pointer Options • MS Word Options • Exercises 1,2,3

  28. Windows Magnifier Magnified view Compressed standard view

  29. Windows Narrator

  30. Practical Session • Windows Magnifier • Windows Narrator • Exercises 4, 5

  31. Magnification Only: • Dolphin - Lunar 431 EURO • Ai Squared - ZoomText Magnifier v9 454 EURO • Magnification with speech : • Dolphin - SuperNova 1222 EURO • Ai Squared - ZoomText Magnifier / Reader 629 EURO • Speech Only (Screen Reader) • Hentor Joyce – JAWS 959 EURO • Dolphin – HAL – 871 EURO

  32. OCR gives easier access to the printed word + = Text-to-Speech enables the user hear the text; for some users this helps to rest their eyes Free text-to-speech utilities: ReadPlease = www.readplease.com

  33. Hands On Session …. SuperNova (Magnification with Speech) JAWS (Screen Reader) Exercise 6,7

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