There is an alphabetical index of USPC classes that you can use. For example, if you look up the word "mouse", you'll see that they are included in class 345.
Unified patents has petitioned for inter parties review of this patent. After rejecting General Patent Corp's preliminary response, the USPTO has granted the inter parties review (as of Oct 10, 2017). There is a strict timeline and this patent will likely be toast in 6-7 months.
Not sure if this is what you are looking for, but the USPTO provides a classification structure that you can navigate through here ==> http://www.uspto.gov/web/patents/classification/selectnumwithtitle.htm
You could do a google search which would look like:
g02c 5/14 site:www.uspto.gov/web/patents/classification
and there is a USPTO page similar to one linked in previous answer: http://www.uspto.gov/web/patents/classification/ but it doesn't have a search system.