Provide a through and compute keyboard interface.

Blind users cannot use a mouse to navigate because the pointers location is unknown.

At mouse actions must be available through the keyboard using keyboard equivalents and keyboard accelerator.

A logical order of screen element navigation is also a requirement for blind users. While this principle is standard for all screen users a failure to adhere to it can be especially confusing for the blind because, they must navigate a screen sequentially in the predetermined navigation order. Their ability to scan the entire contents of a control or screen to establish context is simply not possible.