Final answer:
Inflammation of conjunctiva with purulent discharge and scarring and perforation of cornea signify that the horse's blinded eye is experiencing pain and requires treatment.
Step-by-step explanation:
Inflammation of conjunctiva with purulent discharge can signify that the horse's blinded eye is still experiencing pain. This is characterized by redness and irritation of the eye, blurred vision, sensitivity to light, and progressive corneal scarring, which can lead to blindness. Another condition to watch out for is scarring and perforation of cornea, which can also lead to blindness. These symptoms indicate that treatment is still needed for the horse's blinded eye.