What is the use of these green and red lines on Snellen/Eye chart? - Medical Sciences Stack Exchange

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I read that in eye tests red and green colors are used. For example: But in Snellen/Eye chart, these are not background colors. These are lines only. What is the purpose of it?

Distance Snellen eye chart for vision testing at 20 Feet Visual acuity range 20/100 to 20/16. Includes red and green bars for color vision test. Eye

Snellen Chart with Red Green Lines 20 Feet

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Distance Snellen eye chart for vision testing at 20 Feet Visual acuity range 20/100 to 20/16. Includes red and green bars for color vision test. Eye

Snellen Chart with Red Green Lines 20 Feet