Carry out the STT right before instilling any medication in the attention. Clientele needs to be recommended to prevent supplying their pet any ophthalmic medicines no less than 2 hours just before tear measurement. S⁣p⁣B⁣7⁣o⁣n⁣s⁣ ⁣Z⁣I⁣o⁣ ⁣Z⁣N⁣r⁣e⁣ ⁣d⁣⁣L⁣⁣H⁣⁣ ⁣⁣⁣⁣⁣ Corneal staining is co