Can chorioretinitis cause permanent blindness in my pet?

The extent of vision loss depends on the underlying cause and how quickly treatment begins. Early diagnosis and treatment offer the best chance of preserving or partially restoring vision — delays may lead to irreversible damage. Prompt veterinary evaluation is strongly recommended.

What tests will the vet perform at the appointment?

A complete ophthalmic examination, fundus photography, and ocular ultrasound will typically be performed. Blood tests, cultures, or tissue/cytology sampling may also be carried out to identify the underlying cause.

What records can I keep at home to help the vet?

It is helpful to record when symptoms first appeared and any changes since, take close-up photos and videos of the eye, and bring a complete list of any medications and previous test results.

How often does my pet need follow-up after treatment?

Follow-up frequency depends on the underlying condition and response to treatment. Regular checks of intraocular pressure and vision are typically needed over a period of weeks to months. Follow your vet's recommended schedule.

How much do the tests and treatment usually cost?

Costs vary by clinic and region — ask your vet for an estimate before proceeding.

Disease Guide

Chorioretinitis in Dogs & Cats: Symptoms, Eye Examination & Treatment Guide [2025]

Chorioretinitis is inflammation of the fundus that may be linked to infection or systemic disease. Finding and treating the underlying cause is essential — without treatment, vision may be permanently affected.

Take 1 minute to check the symptoms first

Last updated: 2026/01/05

Pethealthmap Editorial Team

Sources: WSAVA, AVMA, National Taiwan University Veterinary Hospital

When to See a Vet

Seek Emergency Care Immediately

•Sudden complete loss of vision or absence of pupillary light reflex
•Persistent enlargement or obvious protrusion of the eyeball
•Severe eye bleeding or uncontrolled discharge

Schedule a Clinic Visit Soon (within 24-72 hours)

•Sudden decline in vision with noticeable unsteady gait
•Reduced light response or abnormal pupil reaction
•Clear avoidance or pain response when the eye is touched

01What symptoms indicate something is wrong?

Chorioretinitis typically presents as changes in vision along with eye pain and discharge, and symptoms may appear suddenly or worsen gradually.

Sudden decline in vision — bumping into objects or difficulty navigating familiar spaces
Cloudy eyes or reduced response to light (photophobia or abnormal pupillary response)
Eye redness, congestion, or increased discharge (thick or blood-tinged)
Flinching when the eye is touched, frequent blinking, or obvious signs of pain
An ophthalmology appointment is recommended promptly if any of the above symptoms appear

Seek emergency care immediately if you notice the following symptoms:

⚠️ Sudden complete loss of vision or absence of light response
⚠️ Heavy eye bleeding or obvious swelling of the eyeball
⚠️ Altered consciousness, collapse, or abnormal breathing

02How do you assess the situation at home? Key observations and criteria for seeking emergency care

Key points you can observe and record at home help the vet quickly understand the progression of illness and prioritise next steps.

Record when symptoms first appeared and how they have changed over time
Take close-up photos and short videos of the eye using your phone (front and side views)
Monitor for changes in alertness, appetite, water intake, and activity level
Note any changes in urination, bowel movements, and recent weight
If any medications or topical treatments are being used, photograph and list the names and dates of use
An early referral to a specialist clinic capable of fundus examination is recommended

03How will the vet reach a diagnosis? Common diagnostic tests

A full ophthalmic and possible systemic evaluation will be carried out to identify the cause and assess the severity.

Complete ophthalmic examination

pupillary responses, retinal reflexes, and ocular function assessment

Fundus photography or indirect ophthalmoscopy to evaluate retinal and choroidal lesions

Ocular ultrasound to assess for retinal detachment or vitreous opacity

Intraocular pressure measurement and assessment for concurrent glaucoma or other eye conditions

Blood tests, infectious disease panels, or tissue/cytology sampling if indicated

Bacterial or fungal culture to identify potential infectious sources and evaluate systemic factors

A referral to a specialist hospital with fundoscopic equipment is recommended for further evaluation

04How is the condition treated and managed after diagnosis? Medication, dietary adjustments, and home care guide

Treatment aims to control inflammation, address possible infection, and protect vision, with regular monitoring to track changes in condition.

Anti-inflammatory management may be used to reduce intraocular inflammation (to be determined by the vet)
If infection is suspected, appropriate antimicrobial or antifungal therapy will be initiated
Regular follow-up appointments to monitor vision, intraocular pressure, and fundus imaging
Imaging or blood tests arranged to track the underlying cause and treatment response
Home care focuses on preventing scratching, keeping discharge cleaned away, and attending scheduled rechecks as directed
Ongoing follow-up with a specialist capable of fundus examination is recommended to assess visual prognosis

05What should you prepare before the vet visit? Key information to help your vet identify the cause quickly

Note when symptoms started, how they have progressed, and whether there was any sudden worsening

Take recent close-up photos and short videos of the eye (front and side views)

Record any changes in appetite, water intake, and toilet habits

Bring a full list of current medications and supplements with dates of use

If previous test results or imaging are available, bring these along for reference

Call ahead to book an appointment at an ophthalmology clinic with fundus examination capability

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.

Related Symptoms (You May Also Be Looking For)

Vision loss

Unconsciousness

High eye pressure

Severe bleeding

Inner eye inflammation