Smartphones have already proven their worth as navigation devices for sighted people but a new concept aims to go even further for the vision impaired.

对我们这些看的见的人来说，智能手机是个很好的导航设备。 现在有人想做下改进，将智能手机用于视觉受损人群的导航中去。

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Much reading has impaired his vision.

大量读书损害了他的视力。

《新英汉大辞典》

For many disabled persons, especially those who have impaired vision or motor control, this assumption is problematic.

对于许多残疾人士，尤其是那些视力和运动控制受损的人，这个假设是有问题的。

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Samsung has now identified itself as a company willing to accept the loss of accessibility for the vision-impaired as collateral damage in its battle with Apple.

BBC: Samsung struggles to block iPhone function for the blind

The organization helps people in India whose impaired vision, and lack of funds to get care for it, condemns them to poverty.

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Most e-reading devices allow the reader to adjust the font, font size, contrast, column width, and other factors to compensate for impaired vision.

CNN: E-books spur reading among Americans, survey shows