The CEAP classification is the internationally accepted standard for classifying chronic venous disease. The Clinical (C) component is graded $C_0$ through $C_6$: $C_0$ = no signs; $C_1$ = telangiectasias/reticular veins ($<3$ mm); $C_2$ = varicose veins ($>3$ mm); $C_3$ = edema; $C_4$ = skin changes (pigmentation, eczema, lipodermatosclerosis); $C_5$ = healed venous ulcer; $C_6$ = active venous ulcer. Each class carries a symptom qualifier: 'a' (asymptomatic) or 'b' (symptomatic -- pain, heaviness, aching, itching). Varicose veins correspond to $C_2$. Since the question specifies asymptomatic, the suffix is 'a', giving the classification $C_{2a}$. If the same varicose veins were causing symptoms such as leg aching or heaviness, they would be classified as $C_{2b}$. \[\boxed{C_{2a}}\]
