Eyes burn

[Bosch232]

pH is 7.8
Chlorine is low at 2.5 ppm (I added chlorine).

Vinyl lined AG pool.

What else should I test for?

[kelemvor]

Combined Chlorine, Total Alkalinity, CYA, Calcium Hardness

[CarlD]

Actually, I am not aware of calcium hardness affecting or causing burning eyes, even if it is too high. Calcium is useless in a vinyl pool.

[Bosch232]

Here is the full report as of tonight:

FC = 4.0
CC = 0.0
CYA = 55
TA = 120
pH = 7.8

The water looks perfect, as it has all summer.
Not sure what's making our eyes burn.

[CarlD]

I must admit I am baffled. There must be another irritant in the water, but all I have is a few "try this" suggestions in the dark.

Have you added other chemicals like copper, silver, ammonia based algaecides, clarifiers, etc?