"2017. Pensions classified.—The beneficiaries under this chapter shall be divided into four classes, as follows: Soldiers amended, or sailors who are totally blind, or who have lost two limbs, or the entire use thereof, shall be class number one; those who have lost a leg above the knee or an arm above the elbow shall be class number two; those who have lost a hand or a foot, or the entire use thereof, shall be class number three; and all others, including their widows, shall be class number four."
So, in other words, he wasn't totally blind or missing any limbs.
Here's the link to the rest if you are interested, Chapter 43. It breaks down the amount of money given to the different classifications of pensioners as well.