This document describes a study analyzing glacier area changes in the Nevados Caullaraju and Pastoruri regions of Peru between 1984-2011 using Landsat imagery and ancillary data. Historical Landsat 5 TM images from the dry season were processed to estimate clean and debris-covered glacier areas over time. Normalized difference snow index (NDSI) thresholding was used to delineate clean glaciers, but debris-covered areas were difficult to identify. The results found a significant decrease in glaciated area of 3.3 km2 per decade, consistent with ground-based data. However, errors in estimating total area were around 30% due to challenges in identifying debris-covered glaciers with optical remote sensing alone.