Does anybody know what they use for the colour-blind test at Nong Chok?

Is it the board with the coloured dots or a small set of lights?

Thanks.

I was sent to a doctor across the road. Paid 200THB. He held up a blue pen and asked if it is blue or red. Blue. Pass.

28 minutes ago, JeffersLos said:

I was sent to a doctor across the road. Paid 200THB. He held up a blue pen and asked if it is blue or red. Blue. Pass.

JeffersLos You are kidding right.

Was this at Nong Chok?