When cats injure eyes, their claws are almost always to blame. A 50-year-old man in Japan was hurt by something doctors say had not been documented before: the blunt force of his pet cat's forepaw.
After the strike, he had blurred vision and pain in his right eye. Doctors found bleeding in three places: under the thin membrane covering the white of the eye, beneath the retina, and inside the vitreous, the gel that fills the back of the eye. Months later, the injury led to a cataract and high eye pressure, and he needed two operations at once.
Ophthalmologists Daisuke Hasegawa, Yui Nishijima, and Tatsuya Mimura described the case in Cureus in August 2025. Their literature review found 11 earlier cases of eye trauma caused by domestic cats, and every one involved penetrating injuries from claws. To their knowledge, theirs is the first report of blunt eye trauma from a cat's paw, a case the PubMed abstract describes as exceptionally rare.
A Blow, Not a Scratch
The distinction matters because the two injuries work differently. A claw cuts. A paw strike delivers a sudden impact, and the authors believe that force traveled through the wall of the eye and ruptured blood vessels in the retina or the layer beneath it.
The authors described the blunt-trauma mechanism as presumed, since no one can replay the moment of impact, but the findings fit it. Doctors also saw no signs of the iris inflammation linked to cat scratch disease, an infection caused by Bartonella henselae bacteria that the CDC says people usually get from cat scratches, especially from kittens.
At first, the damage seemed manageable. His uncorrected vision in the injured eye was 20/200, but with glasses it reached 20/25. Eye pressure was normal at 16 mmHg, and there was no retinal tear or detachment.
Six Months of Waiting, Then Two Surgeries at Once
Doctors initially chose to watch and wait, hoping the blood in the vitreous would clear on its own. It did not. Over six months, the vitreous stayed cloudy, a cataract formed and progressed, and his eye pressure rose as high as 30 mmHg. Vision in that eye fell to 20/200, and glasses could no longer correct it.
The authors explained that traumatic cataracts form when an impact damages the lens capsule or lens fibers. The rising pressure may have come from blood components, inflammatory cells, or breakdown products of the bleeding blocking the eye's drainage system. An exam of the eye's drainage angle showed it was partly closed, which supported that explanation. The bleeding beneath the retina, meanwhile, had been absorbed by the time of surgery.
Seven months after the injury, surgeons performed a combined procedure: phacoemulsification to remove the cataract, with a multifocal lens implant, and pars plana vitrectomy to remove the clouded vitreous gel.
The result was better than where he started. His corrected vision in the injured eye reached 20/16, according to the report's summary, slightly sharper than the 20/20 benchmark, and his eye pressure settled between 14 and 16 mmHg. The authors credited the absence of a retinal tear or detachment for much of that outcome.
When to Operate Remains an Open Question
The case also touches on a debate in eye trauma care. The authors cited a 2022 study of vitrectomy timing after eye trauma, which found that patients who had surgery on the same day as their injury achieved the best vision and had no cases of proliferative vitreoretinopathy, a scarring complication. Delayed surgery was linked to worse vision and higher risks of that complication and of losing the eye.
Still, the authors wrote that initial conservative treatment remains a reasonable option when there is no retinal tear or detachment, as in this patient. Their decision to wait weighed his preferences against surgical risk.
The earlier cases in their review show how varied cat-related eye injuries can be. Claws caused corneal lacerations, infections inside the eye, and retinal detachment. Three of the 11 cases were reported in the United States, including a 3-year-old boy and a 10-year-old girl described in 2002 and a 32-year-old woman in 2017. Several patients were young children, and outcomes ranged from 20/20 vision or better to vision that could not be measured.
Lessons for Pet Owners
A single case cannot say how often cats cause blunt eye injuries, and the authors did not suggest that ordinary play with cats is dangerous. Most interactions between cats and their owners end without harm.
What the case does show is that serious damage can hide behind a minor-seeming incident. Bleeding in the back of the eye can blur vision without obvious outward signs, and complications such as cataract and raised pressure may take months to appear. The authors urged particular caution with contact near the face, given how quickly cats move, and called for more education about pet-related eye risks.
Anyone who has blurred vision, new floaters, flashes of light, or eye pain after being struck in the eye, even by a pet, should get a prompt exam by an eye care professional. Follow-up visits matter too, since this patient's most serious problems developed months after the injury.
Key Questions Answered
What happened to the man's eye?
A strike from his cat's forepaw caused bleeding under the conjunctiva, beneath the retina, and inside the vitreous gel.
Why is this case considered unusual?
The authors found no earlier reports of blunt eye trauma from a cat's paw. All 11 prior cases in their review involved claw injuries.
Why did he need surgery months later?
The blood did not clear, a cataract developed, and his eye pressure rose to 30 mmHg.
How did he recover?
After cataract removal with a lens implant and vitrectomy, his corrected vision reached 20/16, slightly better than 20/20.
Was cat scratch disease involved?
Doctors found no signs of it. The injury was diagnosed as blunt trauma.
What symptoms after an eye injury need attention?
Blurred vision, new floaters, flashes of light, or eye pain warrant a prompt eye exam, along with follow-up visits.
