Some situations deserve urgency, not watchful waiting. A suddenly cloudy eye, obvious redness, squinting, or a cat who won’t open an eye can signal pain and conditions where time matters. Glaucoma, for example, is associated with increased intraocular pressure and can lead to vision loss; early treatment is emphasized because damage can become irreversible (McLellan, 2011).
Sudden blindness after a procedure is also a reason to call promptly. Rare reports describe blindness after anesthesia or dental procedures, with signs like difficulty tracking and abrupt behavioral change (Stiles J, 2012; Guerreiro C, 2025). Even if your cat seems otherwise “fine,” abrupt vision changes should be treated as medically significant.
If you’re unsure, use a simple rule: if you suspect pain, rapid decline, or one-sided eye changes, contact an emergency or same-day clinic. It’s better to be told it’s mild than to miss a narrow window for protecting comfort and sight.