Our expert says:
Thanks for the history
It now sounds that he probably incurred some trauma to the eye. If you find that the eye is not getting better then take him to the vet - he may have inflamed ocular membranes or he could have a small ulcer on the cornea (outer surface of the eye).
When he goes into the long grass could you please always check for grass seed as they can easily enter the nasal cavity and paws.
I think it might be a good idea to just take him to the vet as he is getting older. It might also be a good idea for you to get some blood taken to check his systems.
Enjoy your day and thank you for replying.
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