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.
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
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.
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.
Look no further, it has been done, at least twice!
The examination corp is organized into Technology Centers.
Under that level are Art Units and each art unit is responsible for a handful of classes.
The USPTO recently started transitioning to a new joint US/EPO classification system called CPC that is based on the European system but with more ...
Look at the classification here. You can download the pdf and search in this.
Furthermore you can use the uspto advanced search and use the operater ccl/ (current classification):