Disease Guide

Dog & Cat Cataracts: Symptoms, Eye Exam & Post-Surgery Care [2025]

Cataracts can cause progressive vision loss and even blindness. Surgery is the only way to restore sight, but a full health assessment and anaesthetic risk evaluation are needed beforehand.

Last updated: 2026/01/05
Pethealthmap Editorial Team
Sources: ACVO, National Taiwan University Veterinary Hospital

When to See a Vet

Seek emergency care immediately

  • Sudden complete vision loss or blindness
  • Eyeball is swollen, protruding, or unable to close
  • Heavy bleeding or purulent discharge from the eye

Schedule a clinic visit soon (within 24–72 hours)

  • White clouding in the eye that is affecting vision
  • Frequently bumping into furniture or obstacles at night
  • Sudden asymmetry or constriction of pupil response

01What Symptoms Indicate a Problem?

Cataracts often cause declining vision and behavioural changes; owners can spot early signs through changes in appearance and everyday activity.

  • White or cloudy patches visible in the eye or pupil
  • Poor vision at night; bumping into furniture or obstacles
  • Reduced activity or reluctance to play due to impaired vision
  • Diminished or unequal pupillary light response between eyes
  • Increased thirst or urination alongside eye changes may indicate an underlying systemic disease
  • Arrange an ophthalmology specialist appointment for early evaluation and monitoring

02How to Assess Abnormalities at Home? Key Observations & When to Seek Emergency Care

Observing and recording changes at home helps your vet make faster, more informed decisions.

  • Track daily water intake and frequency of urination for any changes
  • Take close-up photos of the eyes and videos of your pet walking for the vet's reference
  • Monitor for any decline in appetite, alertness, or activity level
  • Note when symptoms first appeared and how quickly they progressed
  • Watch for redness, discharge, or frequent pawing and scratching at the eyes
  • If vision deteriorates suddenly or behaviour becomes unusual, seek veterinary care promptly

03How Will the Vet Diagnose the Problem? Common Diagnostic Tests

Your vet will conduct a specialist ophthalmology examination alongside general health checks to confirm the cause and discuss treatment options.

Ophthalmic physical examination

including pupillary assessment, menace response, and corneal evaluation

Ocular ultrasound

to assess the lens and posterior segment structures

Advanced imaging (CT/MRI)

used for complex cases or suspected retrobulbar pathology

Blood and biochemistry panel

to screen for concurrent conditions such as diabetes mellitus

Urinalysis

to help diagnose diabetes or other metabolic disorders

Pre-surgical assessment will include discussion of referral to a fully equipped veterinary ophthalmology centre if needed

04How Is It Treated and Managed? Medication, Diet & Care Guide

Treatment for cataracts may involve surgery or conservative management; post-operative follow-up and home care are key to a good outcome.

  • Cataract surgery requires a specialist ophthalmology assessment to evaluate candidacy and risk
  • Pets unsuitable for surgery can be managed long-term with medication and environmental modifications
  • Post-surgery, regular check-ups are needed to monitor vision, intraocular pressure, and signs of infection
  • Long-term follow-up may involve medication adjustments and management of concurrent diseases
  • Home care includes preventing collisions, keeping the area around the eyes clean, and ensuring adequate rest
  • If diabetes mellitus is present concurrently, arrange an internal medicine consultation alongside eye treatment

05What to Prepare Before Your Vet Visit? Key Information to Speed Up Diagnosis

1
Record when symptoms began, how they have changed, and their rate of progression
2
Note any recent changes in diet and water consumption
3
Bring photos of the eyes and videos of your pet walking for the vet to review
4
Prepare a list of current medications and supplements, including dosages
5
Bring any previous blood test results or imaging reports to the appointment
6
Book an appointment at a clinic with ophthalmology equipment or a specialist on-site

This content is for reference only and cannot replace a professional veterinary diagnosis. If your pet shows signs of illness, please seek veterinary care promptly.

Frequently Asked Questions (FAQ)