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<p class="MsoNormal"><span lang="EN-US">Dear members ,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Since 1992 I </span><span lang="EN-GB">work</span><span lang="EN-US"> for Visio, an institution the helps visually
</span><span lang="EN-GB">impaired</span><span lang="EN-GB"> </span><span lang="EN-GB">people</span><span lang="EN-US">. We have always been using the Teller Acuity Cards to determine the visual acuity in children.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">A new test has been presented on the scene, proposing to replace the Teller Acuity cards, because the TAC are expensive and sometime difficult to get. I enclose an example picture of the new cards.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">From my perspective and knowledge they have made some fundamental errors<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span lang="EN-US"><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US">The test seems ambiguous to me, because both object recognition part of our visual system as well as the much ‘lower” detection part of our visual system is triggered by this stimulus<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span lang="EN-US"><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US">The spatial frequency content of these stimuli (checkerboard patterns with a distinctive contour) is in the Fourier domain essentially different from the TAC bar patterns without a contour; nevertheless the
same cycl/cm are used. <o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span lang="EN-US"><span style="mso-list:Ignore">3.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US">In addition to point 2: I think that the contour is a much stronger stimulus than the checkerboards.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Could anybody reflect on this ?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:NL">Most kindley,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:NL"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:NL"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:12.0pt;mso-fareast-language:NL">drs. M.J. de Vries 69024716001<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="mso-fareast-language:NL"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;mso-fareast-language:NL">Revalidatieoogarts<o:p></o:p></span></b></p>
<p class="MsoNormal"><i><span style="font-size:10.0pt;mso-fareast-language:NL">Koninklijke Visio Noord-West Nederland Revalidatie & Advies<o:p></o:p></span></i></p>
<p class="MsoNormal"><span style="font-size:10.0pt;mso-fareast-language:NL">Hettenheuvelweg 41-43 1101 BM Amsterdam<o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;mso-fareast-language:NL">T</span></b><span style="font-size:10.0pt;mso-fareast-language:NL"> 088 585 57 23/585 57 00
<b>M </b>0031 (0)6 50 51 86 13<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;mso-fareast-language:NL"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;mso-fareast-language:NL">Kinderoogarts-Ophthalmogenetica-Strabologie-Revalidatie<o:p></o:p></span></b></p>
<p class="MsoNormal"><i><span style="font-size:10.0pt;mso-fareast-language:NL">Universitair Ziekenhuis Antwerpen afdeling ophthalmologie<o:p></o:p></span></i></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;mso-fareast-language:NL">Wilrijkstraat 10<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;mso-fareast-language:NL">2650 Edegem<o:p></o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;mso-fareast-language:NL">T</span></b><span lang="EN-US" style="font-size:10.0pt;mso-fareast-language:NL"> +32 3 821 30 00
<b>M</b> +31 6 50518613<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:NL"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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