Table 1 Traditional Chinese medicine (TCM) symptom score scale

Blurry visual acuity

▫ 0: None

▫ 2: Mild blurred visual acuity

▫ 4: Unable to read

▫ 6: Difficult to see anything

Narrow visual field

▫ 0: None

▫ 2: As if something obscures visual acuity

▫ 4: Inconvenient to walk

▫ 6: Difficult to walk

Eye distension

▫ 0: None

▫ 2: Mild eye distension

▫ 4: Endurable eye distension

▫ 6: Intolerable eye distension

Dry eye

▫ 0: None

▫ 2: Mild dry eye

▫ 4: Obvious dry eye, as if there is a foreign body in it

▫ 6: Intolerable dry eye, frequent blink

Limp aching lumbus and knees

▫ 0: None

▫ 2: Early morning aching lumbus, which can be alleviated by beating; mild limp knees

▫ 4: Continuous aching lumbus, which will be aggravated when working knees are too limp to carry heavy weight

▫ 6: Severe aching lumbus, which will not be relieved by rest; knees are too limp to desire to walk

Dark purple tongue

▫ 0: No

▫ 2: Yes

Thready pulse deep, string or unsmooth

▫ 0: No

▫ 2: Yes