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to
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The䔀礀攀㰀⼀猀瀀愀渀㸀㰀⼀瀀㸀ഀ
㰀瀀㸀㰀猀琀爀漀渀最㸀㰀漀㨀瀀㸀㰀⼀漀㨀瀀㸀ഀ
A comprehensive summary of practical internet accessibility tips for vision-impaired users
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You Don't See椀渀 㐀䬀㰀⼀愀㸀㰀⼀猀琀爀漀渀最㸀⸀ 䄀 最爀攀愀琀 瘀椀搀攀漀 愀戀漀甀琀 眀栀愀琀 眀攀 爀攀愀氀氀礀 猀攀攀⸀㰀⼀瀀㸀ഀ
㰀瀀㸀㰀猀琀爀漀渀最㸀吀栀爀攀攀 最爀攀愀琀 琀攀猀琀猀 漀昀 礀漀甀爀 挀漀氀漀爀 瘀椀猀椀漀渀 愀戀椀氀椀琀椀攀猀㰀⼀猀琀爀漀渀最㸀㰀⼀瀀㸀ഀ
㰀甀氀 琀礀瀀攀㴀搀椀猀挀㸀ഀ
Very good test. 㰀氀椀 挀氀愀猀猀㴀䴀猀漀一漀爀洀愀氀 猀琀礀氀攀㴀✀洀猀漀ⴀ洀愀爀最椀渀ⴀ琀漀瀀ⴀ愀氀琀㨀愀甀琀漀㬀洀猀漀ⴀ洀愀爀最椀渀ⴀ戀漀琀琀漀洀ⴀ愀氀琀㨀愀甀琀漀㬀ഀ
mso-list:l0 level1 lfo1;tab-stops:list 36.0pt'>Test 2 㰀氀椀 挀氀愀猀猀㴀䴀猀漀一漀爀洀愀氀 猀琀礀氀攀㴀✀洀猀漀ⴀ洀愀爀最椀渀ⴀ琀漀瀀ⴀ愀氀琀㨀愀甀琀漀㬀洀猀漀ⴀ洀愀爀最椀渀ⴀ戀漀琀琀漀洀ⴀ愀氀琀㨀愀甀琀漀㬀ഀ
mso-list:l0 level1 lfo1;tab-stops:list 36.0pt'>Test 3㰀⼀甀氀㸀ഀ
㰀瀀 挀氀愀猀猀㴀愀爀椀愀氀㸀㰀猀琀爀漀渀最㸀㰀猀瀀愀渀 猀琀礀氀攀㴀✀昀漀渀琀ⴀ昀愀洀椀氀礀㨀∀䄀爀椀愀氀∀Ⰰ猀愀渀猀ⴀ猀攀爀椀昀✀㸀㰀愀ഀ
href="http://www.ted.com/talks/beau_lotto_optical_illusions_show_how_we_see?utm_source=email&source=email&utm_medium=social&utm_campaign=ios-share">Beau䰀漀琀琀漀✀猀㰀⼀愀㸀 挀漀氀漀爀 最愀洀攀猀 瀀甀稀稀氀攀 礀漀甀爀 瘀椀猀椀漀渀Ⰰ 戀甀琀 琀栀攀礀 愀氀猀漀 猀瀀漀琀氀椀最栀琀 眀栀愀琀 礀漀甀ഀ
can't normally see: how your brain works.
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And Why The Media Loves Miracle䌀甀爀攀猀㰀⼀猀瀀愀渀㸀㰀⼀猀琀爀漀渀最㸀㰀⼀瀀㸀ഀ
㰀瀀 挀氀愀猀猀㴀愀爀椀愀氀㸀㰀猀琀爀漀渀最㸀㰀猀瀀愀渀 猀琀礀氀攀㴀✀昀漀渀琀ⴀ昀愀洀椀氀礀㨀∀䄀爀椀愀氀∀Ⰰ猀愀渀猀ⴀ猀攀爀椀昀✀㸀圀栀愀琀 椀猀 琀栀攀ഀ
Resolution of the Human Eye?
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㰀琀搀 眀椀搀琀栀㴀∀㌀㌀─∀ 猀琀礀氀攀㴀✀眀椀搀琀栀㨀㌀㌀⸀ ─㬀戀漀爀搀攀爀㨀椀渀猀攀琀 ⌀ ⸀ 瀀琀㬀洀猀漀ⴀ戀漀爀搀攀爀ⴀ愀氀琀㨀ഀ
inset #111111 .75pt;padding:0cm 0cm 0cm 0cm'> 㰀瀀 挀氀愀猀猀㴀䴀猀漀一漀爀洀愀氀 愀氀椀最渀㴀挀攀渀琀攀爀 猀琀礀氀攀㴀✀琀攀砀琀ⴀ愀氀椀最渀㨀挀攀渀琀攀爀✀㸀㰀戀㸀㰀猀瀀愀渀ഀ
lang=EN-US style='font-family:"Arial",sans-serif;mso-fareast-font-family: ∀吀椀洀攀猀 一攀眀 刀漀洀愀渀∀㬀洀猀漀ⴀ愀渀猀椀ⴀ氀愀渀最甀愀最攀㨀䔀一ⴀ唀匀✀㸀嘀椀攀眀 昀爀漀洀 琀栀攀 倀攀爀椀瀀栀攀爀愀氀 刀攀琀椀渀愀㰀⼀猀瀀愀渀㸀㰀⼀戀㸀㰀猀瀀愀渀ഀ
style='mso-fareast-font-family:"Times New Roman"'>
㰀⼀琀搀㸀ഀ
㰀瀀 挀氀愀猀猀㴀䴀猀漀一漀爀洀愀氀 愀氀椀最渀㴀挀攀渀琀攀爀 猀琀礀氀攀㴀✀琀攀砀琀ⴀ愀氀椀最渀㨀挀攀渀琀攀爀✀㸀㰀戀㸀㰀猀瀀愀渀ഀ
lang=EN-US style='font-family:"Arial",sans-serif;mso-fareast-font-family: ∀吀椀洀攀猀 一攀眀 刀漀洀愀渀∀㬀洀猀漀ⴀ愀渀猀椀ⴀ氀愀渀最甀愀最攀㨀䔀一ⴀ唀匀✀㸀☀渀戀猀瀀㬀䄀挀琀甀愀氀 瘀椀攀眀㰀⼀猀瀀愀渀㸀㰀⼀戀㸀㰀猀瀀愀渀ഀ
style='mso-fareast-font-family:"Times New Roman"'> 㰀⼀琀搀㸀ഀ
| 㰀瀀 挀氀愀猀猀㴀䴀猀漀一漀爀洀愀氀 愀氀椀最渀㴀挀攀渀琀攀爀 猀琀礀氀攀㴀✀琀攀砀琀ⴀ愀氀椀最渀㨀挀攀渀琀攀爀✀㸀㰀戀㸀㰀猀瀀愀渀ഀ
lang=EN-US style='font-family:"Arial",sans-serif;mso-fareast-font-family: ∀吀椀洀攀猀 一攀眀 刀漀洀愀渀∀㬀洀猀漀ⴀ愀渀猀椀ⴀ氀愀渀最甀愀最攀㨀䔀一ⴀ唀匀✀㸀嘀椀攀眀 昀爀漀洀 琀栀攀 䘀漀瘀攀愀㰀⼀猀瀀愀渀㸀㰀⼀戀㸀㰀猀瀀愀渀ഀ
style='mso-fareast-font-family:"Times New Roman"'> 㰀⼀琀搀㸀ഀ
㰀⼀琀愀戀氀攀㸀ഀ
㰀瀀㸀㰀戀㸀㰀猀瀀愀渀 猀琀礀氀攀㴀✀昀漀渀琀ⴀ昀愀洀椀氀礀㨀∀䄀爀椀愀氀∀Ⰰ猀愀渀猀ⴀ猀攀爀椀昀㬀挀漀氀漀爀㨀眀栀椀琀攀㬀洀猀漀ⴀ挀漀氀漀爀ⴀ愀氀琀㨀ഀ
windowtext'>The is so enigmatic that it disappears when it is looked at搀椀爀攀挀琀氀礀Ⰰ 猀愀礀猀 倀爀漀昀攀猀猀漀爀 㰀愀ഀ
href="http://neuro.med.harvard.edu/faculty/livingstone.html">Margaret䰀椀瘀椀渀最猀琀漀渀攀㰀⼀愀㸀 漀昀 䠀愀爀瘀愀爀搀㰀⼀猀瀀愀渀㸀㰀⼀戀㸀㰀戀㸀㰀猀瀀愀渀 氀愀渀最㴀䔀一ⴀ唀匀 猀琀礀氀攀㴀✀昀漀渀琀ⴀ昀愀洀椀氀礀㨀ഀ
"Arial",sans-serif;mso-ansi-language:EN-US'>.ഀ
The second picture is grey the entire time.圀栀攀渀 礀漀甀 欀攀攀瀀 礀漀甀爀 攀礀攀猀 椀渀 琀栀攀 搀漀琀Ⰰ 琀栀攀 瀀椀挀琀甀爀攀 椀猀 猀攀攀渀 椀渀 挀漀氀漀爀⸀ 圀栀攀渀 礀漀甀 氀漀漀欀ഀ
elsewhere it returns to black and white. How does your mind put all those挀漀氀漀爀猀 琀栀攀爀攀㼀㰀⼀猀瀀愀渀㸀㰀⼀猀琀爀漀渀最㸀㰀⼀瀀㸀ഀ
㰀瀀㸀㰀戀㸀㰀猀瀀愀渀 猀琀礀氀攀㴀✀昀漀渀琀ⴀ昀愀洀椀氀礀㨀∀䄀爀椀愀氀∀Ⰰ猀愀渀猀ⴀ猀攀爀椀昀✀㸀匀攀攀 栀漀眀 䐀愀瘀椀搀 圀椀氀氀椀愀洀猀 甀猀攀猀 㰀愀ഀ
href="http://www.cvs.rochester.edu/williamslab/">adaptive optics to view挀漀渀攀猀 椀渀 琀栀攀 栀甀洀愀渀 攀礀攀⸀㰀⼀猀瀀愀渀㸀㰀⼀戀㸀㰀戀㸀㰀猀瀀愀渀 氀愀渀最㴀䔀一ⴀ唀匀 猀琀礀氀攀㴀✀昀漀渀琀ⴀ昀愀洀椀氀礀㨀∀䄀爀椀愀氀∀Ⰰ猀愀渀猀ⴀ猀攀爀椀昀㬀ഀ
mso-ansi-language:EN-US'> How this technique can be used to study infant猀攀攀猀㰀⼀愀㸀⸀ 䘀爀漀洀 倀䈀匀㰀⼀猀瀀愀渀㸀㰀⼀戀㸀㰀戀㸀㰀猀瀀愀渀 氀愀渀最㴀䔀一ⴀ唀匀 猀琀礀氀攀㴀✀昀漀渀琀ⴀ昀愀洀椀氀礀㨀∀䄀爀椀愀氀∀Ⰰ猀愀渀猀ⴀ猀攀爀椀昀㬀ഀ
mso-ansi-language:EN-US'>. Kettlewell Eye Research Institute. ഀ
Visit the fading搀漀琀㰀⼀愀㸀 愀渀搀 琀栀攀 㰀愀ഀ
href="http://www.exploratorium.edu/exhibits/gray_step/index.html">sliding grey猀琀攀瀀㰀⼀愀㸀⸀㰀⼀猀瀀愀渀㸀㰀⼀戀㸀㰀⼀瀀㸀ഀ
㰀瀀㸀㰀戀㸀㰀猀瀀愀渀 猀琀礀氀攀㴀✀昀漀渀琀ⴀ昀愀洀椀氀礀㨀∀䄀爀椀愀氀∀Ⰰ猀愀渀猀ⴀ猀攀爀椀昀✀㸀㰀愀ഀ
href="http://news.bbc.co.uk/hi/english/sci/tech/newsid_1220000/1220210.stm">CIndividualswho are b to some colours sensitiv "colour搀椀洀攀渀猀椀漀渀☀焀甀漀琀㬀 㰀⼀愀㸀琀栀愀琀 椀猀 椀渀愀挀挀攀猀猀椀戀氀攀 琀漀 琀栀漀猀攀 眀椀琀栀 渀漀爀洀愀氀 挀漀氀漀甀爀 瘀椀猀椀漀渀⸀ 㰀⼀猀瀀愀渀㸀㰀⼀戀㸀㰀⼀瀀㸀ഀ
㰀瀀㸀㰀戀㸀㰀猀瀀愀渀 猀琀礀氀攀㴀✀昀漀渀琀ⴀ昀愀洀椀氀礀㨀∀䄀爀椀愀氀∀Ⰰ猀愀渀猀ⴀ猀攀爀椀昀✀㸀㰀愀ഀ
href="http://faculty.washington.edu/chudler/eyed.html">Common Eye Diseases and䐀椀猀漀爀搀攀爀猀㰀⼀愀㸀㰀⼀猀瀀愀渀㸀㰀⼀戀㸀㰀戀㸀㰀猀瀀愀渀 氀愀渀最㴀䔀一ⴀ唀匀 猀琀礀氀攀㴀✀昀漀渀琀ⴀ昀愀洀椀氀礀㨀∀䄀爀椀愀氀∀Ⰰ猀愀渀猀ⴀ猀攀爀椀昀㬀ഀ
mso-ansi-language:EN-US'>. ഀ
. ഀ
. 㰀琀爀 猀琀礀氀攀㴀✀洀猀漀ⴀ礀昀琀椀ⴀ椀爀漀眀㨀 㬀洀猀漀ⴀ礀昀琀椀ⴀ昀椀爀猀琀爀漀眀㨀礀攀猀✀㸀ഀ
| 㰀瀀 挀氀愀猀猀㴀䴀猀漀一漀爀洀愀氀 愀氀椀最渀㴀挀攀渀琀攀爀 猀琀礀氀攀㴀✀琀攀砀琀ⴀ愀氀椀最渀㨀挀攀渀琀攀爀✀㸀㰀戀㸀㰀猀瀀愀渀ഀ
style='font-family:"Arial",sans-serif;mso-fareast-font-family:"Times New Roman"'>Original 椀洀愀最攀㰀⼀猀瀀愀渀㸀㰀⼀戀㸀㰀猀瀀愀渀 猀琀礀氀攀㴀✀洀猀漀ⴀ昀愀爀攀愀猀琀ⴀ昀漀渀琀ⴀ昀愀洀椀氀礀㨀∀吀椀洀攀猀 一攀眀 刀漀洀愀渀∀✀㸀㰀漀㨀瀀㸀㰀⼀漀㨀瀀㸀㰀⼀猀瀀愀渀㸀㰀⼀瀀㸀ഀ
| 㰀琀搀 眀椀搀琀栀㴀㐀㔀㔀 猀琀礀氀攀㴀✀眀椀搀琀栀㨀㌀㐀⸀㈀㔀瀀琀㬀瀀愀搀搀椀渀最㨀㐀⸀ 瀀琀 㐀⸀ 瀀琀 㐀⸀ 瀀琀 㐀⸀ 瀀琀✀㸀ഀ
no 最爀攀攀渀 猀攀渀猀椀琀椀瘀攀 挀漀渀攀㰀⼀猀瀀愀渀㸀⤀⸀ 吀栀椀猀 氀攀愀搀猀 琀漀 愀渀 椀渀愀戀椀氀椀琀礀 椀渀 搀椀猀琀椀渀最甀椀猀栀椀渀最ഀ
between red and green.
㰀⼀琀搀㸀ഀ
㰀琀爀 猀琀礀氀攀㴀✀洀猀漀ⴀ礀昀琀椀ⴀ椀爀漀眀㨀✀㸀ഀ
㰀瀀 挀氀愀猀猀㴀䴀猀漀一漀爀洀愀氀 愀氀椀最渀㴀挀攀渀琀攀爀 猀琀礀氀攀㴀✀琀攀砀琀ⴀ愀氀椀最渀㨀挀攀渀琀攀爀✀㸀㰀猀瀀愀渀ഀ
style='font-family:"Arial",sans-serif;mso-fareast-font-family:"Times New Roman"'> 㰀琀搀 眀椀搀琀栀㴀㐀㔀㔀 猀琀礀氀攀㴀✀眀椀搀琀栀㨀㌀㐀⸀㈀㔀瀀琀㬀瀀愀搀搀椀渀最㨀㐀⸀ 瀀琀 㐀⸀ 瀀琀 㐀⸀ 瀀琀 㐀⸀ 瀀琀✀㸀ഀ
㰀⼀琀搀㸀ഀ
㰀琀爀 猀琀礀氀攀㴀✀洀猀漀ⴀ礀昀琀椀ⴀ椀爀漀眀㨀㈀✀㸀ഀ
| 㰀瀀 挀氀愀猀猀㴀䴀猀漀一漀爀洀愀氀 愀氀椀最渀㴀挀攀渀琀攀爀 猀琀礀氀攀㴀✀琀攀砀琀ⴀ愀氀椀最渀㨀挀攀渀琀攀爀✀㸀㰀戀㸀㰀猀瀀愀渀ഀ
style='font-family:"Arial",sans-serif;mso-fareast-font-family:"Times New Roman"'>Simulated 椀洀愀最攀 漀昀 瘀椀猀椀漀渀 眀椀琀栀 㰀⼀猀瀀愀渀㸀㰀⼀戀㸀㰀戀㸀㰀猀瀀愀渀 猀琀礀氀攀㴀✀洀猀漀ⴀ戀椀搀椀ⴀ昀漀渀琀ⴀ猀椀稀攀㨀 ⸀ 瀀琀㬀ഀ
font-family:"Arial",sans-serif;mso-fareast-font-family:"Times New Roman"'>trinitarianno blue sensitive cone). This leads to an 椀渀愀戀椀氀椀琀礀 椀渀 搀椀猀琀椀渀最甀椀猀栀椀渀最 戀攀琀眀攀攀渀 戀氀甀攀 愀渀搀 礀攀氀氀漀眀⸀㰀⼀猀瀀愀渀㸀㰀⼀戀㸀㰀猀瀀愀渀ഀ
style='mso-fareast-font-family:"Times New Roman"'> 㰀⼀琀搀㸀ഀ
| 㰀瀀 挀氀愀猀猀㴀䴀猀漀一漀爀洀愀氀 愀氀椀最渀㴀挀攀渀琀攀爀 猀琀礀氀攀㴀✀琀攀砀琀ⴀ愀氀椀最渀㨀挀攀渀琀攀爀✀㸀㰀戀㸀㰀猀瀀愀渀ഀ
style='font-family:"Arial",sans-serif;mso-fareast-font-family:"Times New Roman"'>Simulated 椀洀愀最攀 漀昀 瘀椀猀椀漀渀 椀渀 愀 瀀攀爀猀漀渀 眀椀琀栀 瀀爀漀氀攀琀愀爀椀愀渀 ⠀㰀猀瀀愀渀 猀琀礀氀攀㴀✀挀漀氀漀爀㨀爀攀搀✀㸀渀漀 爀攀搀ഀ
sensitive cone). This, just like deuteranopia, 氀攀愀搀猀 琀漀 愀渀 椀渀愀戀椀氀椀琀礀 椀渀 搀椀猀琀椀渀最甀椀猀栀椀渀最 戀攀琀眀攀攀渀 爀攀搀 愀渀搀 最爀攀攀渀⸀㰀⼀猀瀀愀渀㸀㰀⼀戀㸀㰀猀瀀愀渀ഀ
style='mso-fareast-font-family:"Times New Roman"'> 㰀⼀琀搀㸀ഀ
㰀琀爀 猀琀礀氀攀㴀✀洀猀漀ⴀ礀昀琀椀ⴀ椀爀漀眀㨀㌀㬀洀猀漀ⴀ礀昀琀椀ⴀ氀愀猀琀爀漀眀㨀礀攀猀✀㸀ഀ
| 㰀瀀 挀氀愀猀猀㴀䴀猀漀一漀爀洀愀氀 愀氀椀最渀㴀挀攀渀琀攀爀 猀琀礀氀攀㴀✀琀攀砀琀ⴀ愀氀椀最渀㨀挀攀渀琀攀爀✀㸀㰀猀瀀愀渀ഀ
style='mso-fareast-font-family:"Times New Roman"'> 㰀瀀 挀氀愀猀猀㴀䴀猀漀一漀爀洀愀氀 愀氀椀最渀㴀挀攀渀琀攀爀 猀琀礀氀攀㴀✀琀攀砀琀ⴀ愀氀椀最渀㨀挀攀渀琀攀爀✀㸀㰀猀瀀愀渀ഀ
style='mso-fareast-font-family:"Times New Roman"'> ഀ
㰀琀搀 猀琀礀氀攀㴀✀瀀愀搀搀椀渀最㨀⸀㜀㔀瀀琀 ⸀㜀㔀瀀琀 ⸀㜀㔀瀀琀 ⸀㜀㔀瀀琀✀㸀ഀ
and Pharmacology 㰀⼀猀瀀愀渀㸀㰀⼀戀㸀㰀猀瀀愀渀 猀琀礀氀攀㴀✀昀漀渀琀ⴀ猀椀稀攀㨀㜀⸀㔀瀀琀㬀挀漀氀漀爀㨀洀愀爀漀漀渀✀㸀唀渀椀瘀攀爀猀椀琀礀 漀昀 圀攀猀琀攀爀渀ഀ
Ontario 䰀漀渀搀漀渀 伀渀琀愀爀椀漀 䌀愀渀愀搀愀㰀⼀猀瀀愀渀㸀㰀⼀瀀㸀ഀ
㰀琀搀 猀琀礀氀攀㴀✀瀀愀搀搀椀渀最㨀⸀㜀㔀瀀琀 ⸀㜀㔀瀀琀 ⸀㜀㔀瀀琀 ⸀㜀㔀瀀琀✀㸀ഀ
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