There are many forms of visual impairments, from correctable vision via eyeglasses to complete blindness. My daughter Abby has almost no discernable vision. In my forays through the Internet, I have found so much information on visual impairments and related topics.
Braille is very interesting to learn by sight.
It is also very organized. The difference is that in Grade 1 Braille, every letter in every word is spelled out. Grade 2 Braille is contracted, meaning that commonly occuring groups of letters are shortened into one or two cells instead of having each letter standing alone. Some examples are shown in the gif above. Enabling Technologies has info for Braille and your computer.