Different eye conditions create different difficulties. Very few blind people see nothing at all. A minority can distinguish light but nothing else. Some have no central vision; others have no side vision. Some see everything as a vague blur; others see a patchwork of blanks and defined areas. Some people with impaired vision can see enough to read this, though they may have difficulty crossing the road (RNIB).
Most students will already have a preferred system of accessing information. This will usually be large print, audio tape, Braille or electronic format. Many students use a combination of these.
You should consider:
Often the easiest way to make documents accessible to students who are blind or partially sighted can include using the web and forwarding documents by email.