验光师

• 馬(horse)RADICAL
• 僉(all; unanimous)PHONETIC

Testing is like trying out a horse — you must let everyone examine it together to know if it's real or fake.

• ⺌(small light radiating upward)ASSOCIATIVE
• 兀(standing person; upright person)ASSOCIATIVE

Light shining down from above a person standing upright creates the image of 光, meaning light.