Earlier Diagnosis of Peripheral Neuropathy Using A Simple sCreening Tool (ACT)

This study is looking at people with diabetes (type 1 and type 2 diabetes) to see how well a short questionnaire, called the ACT, can identify nerve damage in the feet and legs (also known as peripheral neuropathy). The investigators will compare the ACT questionnaire to other commonly used tools (the DN4 and Michigan Neuropathy Screening Instrument) and to an eye-test that detects small nerve fibers in the eye (called corneal confocal microscopy, or CCM). The main goal is to find out if the ACT questionnaire is accurate in detecting nerve damage and painful nerve damage caused by diabetes. The investigators will also look at whether changes in blood sugar levels, measured with a continuous glucose monitor (Freestyle Libre 3 and iCan), are linked to nerve pain and small nerve fiber damage.