So why is its eye enlarged? The intraocular pressure is 29mmHg just in case that helps you (or on the other hand it might just confuse you!)
The most likely explanation is that inflammatory debris has clogged up the iridocorneal drainage angle with a mild but long-term rise in intraocular pressure. The other possibility is that the enlarged lymphoid follicles in the peripheral iris have resulted in an angle-closure glaucoma. We won’t know till the eye comes out but for the moment the cat is comfortable and the pressure lowish (presumably because of the interaction between the glaucoma raising it and the inflammation lowering it) so we’ll leave surgery for the time being!