Happily, Web authors can anticipate many human imperfections, and design to accommodate them. Accommodating Visual Impairments Visual impairments range in magnitude from merely annoying to truly catastrophic. But most people either suffer from some form of vision impairment, or else they will, at some point in their lives.
Many visual impairments are relatively simple for a Web author to accommodate.
Avoid using absolute font tags Readers whose vision is limited may set their browsers to display text in a certain size or typeface that they find particularly legible. Trying to substitute your judgment for theirs is presumptuous, at best. For reasons that are completely enshrouded in mystery, many Websites seem to have a severe allergy to whitespace. But a content-driven site can't possibly include all its content into 170 or so square inches of screen. Once scrolling becomes inevitable, liberal use of whitespace becomes a necessity, for both reader comfort and effective comprehension.