si6 lik6 caak1 ding6 faat3视力测定法
Jyutpingsi6 lik6 caak1 ding6 faat3
Yalesih likh chāk dingh fat

Definition

optometry

Tone guide

T1High level
T2High rising
T3Mid level
T4Low falling
T5Low rising
T6Low level

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