Hello, I'm Dr. Deb and will do my best to help you today.
I'm sorry for this issue with Tommy's eye.
As long as he's not keeping it closed or squinting with it (which might indicate an injury to his cornea or possibly some other, more serious issues), then it may be possible to treat him at home (see the list I've provided below).
If he has a corneal scratch, then he will need topical antibiotics as well as topical pain drugs which your vet will have to dispense.
But if he has only slightly irritated the eye, then he may respond to otc eye drops.
At his point, it's not possible to tell which condition he has.
I would advise the following:
1. You can gently rinse the eye with over the counter saline solution which should be available at most human pharmacies. You don't want to use the contact lens solution, though.
2. You can apply a warm wash cloth to the eye/area for about 5-10 minutes which can provide relief. This can be repeated every hour if you'd like.
3. The Systane products which are listed can be used, but the ones with vasoconstrictors, such as naphazoline should be avoided. These products are labeled as "taking the red out" or for "red eye".
Tears Naturale Nighttime
Systane Ultra lubricant sterile eye drops
Advanced Eye Relief Nighttime
Akwa Tears ointment
I'm not sure what you might have available in the UK which is why I've listed so many options.
I typically treat 3-4 times a day for 7-10 days. If the eye looks worse, then Tommy may be having an adverse reaction to what you're using and it should be discontinued.
If there's no improvement and/or other signs develop (such as sneezing or lethargy), then a vet visit may be prudent.
I hope this helps. Deb