I can't stress enough that eye problems MUST be seen ASAP!
Never self treat any eye problems without directly consulting with your veterinarian. It's good you have a swift appointment but if you have an emergency clinic nearby, an even earlier appointment is greatly advised.
Eye damage can become rapidly worse when treating with any drops/medications not recommended by your vet - especially with visible damage, it may become irreversible, potentially leading to eye loss. Even if a pet's eye seems undamaged, there can be corneal damage that must be specially diagnosed by an eye exam from the vet.