Compression is measured in mmHg. Lighter levels (8 to 15) suit mild swelling and tired legs, while higher levels are usually recommended by a clinician. Get the size right, and a sock aid makes putting them on far easier.
How can someone with limited reach care for their feet?
Long-handled tools (a sponge, a lotion applicator, and easy-grip clippers with a magnifier) let someone care for their feet without bending. For nail trimming with diabetes or poor circulation, it's safest to see a podiatrist.