年前，人们认为要让有视觉障碍的人(甚至盲人)使用Web是非常可笑的；但今天却实现了。
Ten years ago, the idea that the vision-impaired or even the blind might use the Web seemed ridiculous; today it is a simple reality.
除了有视觉障碍的人外，我们都是在透过一个类似于视频摄像机的广角镜头来感知周围的环境。
Barring visual impairments, we perceive our surroundings via a video camera-like, wide-angle lens.
当很多人在等待图片下载的时候，发现图片的ALT标记很有用，同时很多人知道它对有视觉障碍的人士很有用。
ALT tags. A lot of people find an image's ALT tags useful for while they wait for the images to download, and most people know that they are also useful for the visually impaired.
应用表明：该交通信号声讯器安装简单，工作稳定，声讯提示清晰，为有视觉障碍的行人横过马路提供了极大方便。
On-the-spot experiments proves steady operation and easy installation and clear sound prompt of the device which can offer great convenience to the blind pedestrians.
最大的障碍是那些有很强视觉质感却又很少显著标记物的东西。
The biggest obstacles are in one category: Objects without a strong "visual texture," and with few distinct markings.
例如，您可以采用一些步骤以确保使用屏幕阅读器可以正确读取web页面，这样的屏幕阅读器可以为视觉有障碍的人大声朗读web页面。
For example, you can take steps to make sure that your Web pages can be read properly with screen readers, which read Web pages aloud to people who have difficulty seeing them.
“讲述人”为视觉有障碍的用户提供最基本的使用功能。在日常使用中，视觉有障碍的用户需要功能更强的屏幕读取器工具。
Narrator is intended to provide a minimum level of functionality for blind users. Blind users will need a screen reader utility program with higher functionality for daily use.
试验表明，有视觉障碍者对三类出口标志的识别能力与无视觉障碍者之间存在很大差距。
Experiment shows there are great differences in the ability to distinguish three types of exit signs between persons having obstacle of visual sense and persons having no obstacle of visual.
试验表明，有视觉障碍者对三类出口标志的识别能力与无视觉障碍者之间存在很大差距。
Experiment shows there are great differences in the ability to distinguish three types of exit signs between persons having obstacle of visual sense and persons having no obstacle of visual.
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