An eye can look red, cloudy, watery, or irritated for many different reasons; appearance alone rarely tells the whole story. Animal Eye Care of New England provides specialty veterinary eye care for pets in the Providence, RI area. As your veterinary ophthalmologist, we can evaluate the eye’s surface, internal structures, visual function, and sometimes health problems elsewhere in the body.

Diagnosing eye problems in pets usually begins with a history and observation before using specialized tests. Veterinary eye tests for pets can assess tear production, corneal integrity, intraocular pressure, the lens, the retina, and the neurological responses involved in vision. Veterinary ophthalmology exams can also be adapted to the animal. This is especially important for exotic pets, because their anatomy, behavior, handling, and lab findings are often very different from dogs and cats.

What Happens During an Ophthalmic Examination?

A detailed ophthalmic examination follows a logical sequence. This is done purposely, because some tests can affect the results of others. We first observe the eyes and surrounding tissues, looking for symmetry, abnormal position, swelling, discharge, obvious lesions, or differences between the two sides. We also assess visual and neurological responses, and may measure how drops or other treatments alter the eye.

The examination then becomes more detailed. Tests may include measuring tear production, fluorescein staining of the cornea, and intraocular pressure. Using magnification and focused illumination, the veterinarian will examine the eyelids, conjunctiva, cornea, iris, anterior chamber, and lens.

When appropriate, the veterinarian dilates the pupils to examine deeper structures more thoroughly. The veterinarian can then evaluate the vitreous, retina, retinal blood vessels, and optic nerve with ophthalmoscopic equipment. Additional diagnostic tests or recommended tests are always based on what the initial exam reveals.

Your Pet’s History Is Part of the Diagnosis

Tell the veterinarian about previous eye injuries, earlier diagnoses, current medications, and any eye medication recently used. It’s important for your pet’s team to know if you have noticed anything unusual at home. Useful details include when the problem started, whether it appeared suddenly or gradually, whether one or both eyes are affected, and whether the symptoms are constant or intermittent. Changes in vision, behavior, appetite, or overall health can also provide important clues.

If your pet has diabetes, high blood pressure, infectious disease, immune-mediated disease, or another medical condition, that history may influence the diagnostic approach. Eye abnormalities can sometimes be associated with disease elsewhere in the body.

Photographs and videos can be useful for documenting changes. A video showing unusual navigation, blinking, or visual behavior may provide key information. Never delay urgent veterinary care just to take a better photo or recording.

Visual and Neurological Responses Provide Early Clues

We cannot evaluate Fido’s vision by asking him to read an eye chart, so we rely on diagnostics, behavioral observations, and neurological responses. The examination may include the menace response, pupillary light reflexes, and dazzle reflex. Each of these things evaluates a different part of the ocular or neurological system and must be interpreted in context.

Pupillary light reflex testing evaluates how the pupils respond when light enters the eye. This provides information about the retina, optic nerve, brain pathways, and nerves controlling the pupil, but it does not test conscious vision. An animal can have a pupillary response without having normal vision.

The Schirmer Tear Test Measures Tear Production

Low tear production can contribute to ocular surface irritation and corneal disease. The Schirmer tear test measures aqueous tear production. A narrow paper strip is placed inside the lower eyelid, where it will wick up moisture, which is then measured. This test should generally be performed before the eye is cleaned or medicated, as these can alter tear production and skew the result. 

Fluorescein Staining Checks the Corneal Surface

A corneal defect can be hard to see with the unaided eye, even when it hurts. Fluorescein is a diagnostic dye commonly used to identify defects in the corneal epithelium. This test is especially useful when a pet squints or rubs an eye after suspected trauma. Healthy corneal epithelium does not retain the dye in the same way exposed underlying corneal tissue does. When a scratch or ulcer disrupts that protective surface, fluorescein can highlight the damaged area.

The stain has uses beyond identifying a basic corneal ulcer. It is used to examine things like scratches and abrasions, and can help assess corneal integrity in deeper wounds and, in certain situations, evaluate tear-film behavior or tear drainage. 

Tonometry Measures Pressure Inside the Eye

Tonometry measures intraocular pressure, or the pressure within the eyeball. A small instrument called a tonometer is used to obtain the measurement. Depending on the tonometer type and the patient, the veterinarian may use topical anesthetic before testing.

Pressure is important when glaucoma or uveitis is suspected. Elevated pressure is a hallmark of glaucoma, while inflammation inside the eye can alter pressure in other ways. The veterinarian compares the measurement with the rest of the examination rather than diagnosing disease from a single number.

Veterinarians generally perform tonometry before pupil dilation. If pressure is elevated, dilation may be inappropriate because it can further affect pressure in certain circumstances. This sequencing shows why a structured examination matters.

Slit-Lamp Examination Provides a Magnified View

Slit-lamp biomicroscopy gives the veterinary ophthalmologist a magnified, illuminated view of structures at the front of the eye. It lets the veterinarian evaluate the cornea, anterior chamber, iris, and lens in much greater detail than the unaided eye allows. Subtle abnormalities can become much easier to localize.

A slit lamp can help characterize corneal disease, inflammation, cataracts, and other changes. Determining exactly where an opacity lies is particularly valuable because a cloudy-looking eye can reflect disease of the cornea, fluid inside the eye, or the lens. These conditions can look similar to an owner but have very different causes and treatments.

The examination is usually performed in controlled lighting, so the room may be darkened for parts of the evaluation. Cooperation requirements vary by patient. Some animals tolerate detailed examination readily, while others may need modified handling or sedation for particular procedures.

Dilated Examination Reveals the Lens, Retina, and Optic Nerve

After completing pressure and other appropriate baseline tests, the veterinarian may dilate the pupil using medication. A larger pupil creates a better view of structures deeper within the eye. This is particularly useful for examining the lens, vitreous, retina, retinal blood vessels, and optic nerve.

Direct and indirect ophthalmoscopy are techniques used to evaluate the back of the eye. Indirect ophthalmoscopy provides a broad view of the ocular fundus, while other instruments can provide additional detail. During this part of the exam, the veterinarian may identify retinal degeneration, inflammation, hemorrhage, detachment, optic nerve changes, and other abnormalities.

Not every eye can be fully examined visually. A dense cataract, severe corneal opacity, bleeding, or another obstruction may prevent the veterinarian from seeing the retina directly. In those cases, advanced diagnostic testing can help answer questions about structures hidden from view.

Ocular Ultrasound Can Look Behind an Opaque Eye

Ultrasound uses sound waves to create images of structures within and behind the eye. It can be especially useful when cataracts, corneal opacity, blood, or other problems prevent direct examination of deeper ocular structures. The test can provide information that shining light into the eye cannot.

Ocular ultrasonography may help evaluate the retina, lens position, masses, or other structural abnormalities. It is also useful when the veterinarian needs to determine what is happening behind an opacity. The exact information sought depends on the suspected disease.

Some patients tolerate ultrasound with topical anesthesia and gentle restraint, while others may require sedation depending on species, temperament, pain, and the diagnostic procedure. The veterinary team balances the test’s value with safe handling and patient comfort.

Electroretinography Evaluates Retinal Function

Electroretinography, often abbreviated ERG, measures the retina’s electrical responses to light stimulation. This specialized test can provide information about retinal function. Electroretinography is also used when investigating retinal disease or inherited retinal degeneration, or before certain surgical procedures that require assessing retinal function. 

For example, a dense cataract may block direct visualization of the retina. However, knowing whether the retina functions properly is important to treatment planning. An ERG can help answer that question.

Veterinarians typically use ERG tests to answer a specific diagnostic question about retinal function. 

Additional Veterinary Eye Tests for Pets

Some conditions require sampling or testing beyond the routine ophthalmic examination. Corneal or conjunctival cytology examines cells collected from the ocular surface. Cultures can help investigate suspected bacterial or fungal infection. 

The tear-drainage system can also be evaluated. A Jones test may use fluorescein to see whether dye placed on the ocular surface travels through the nasolacrimal system and appears at the nostril. If it does, the duct is open. If no dye appears, it is blocked.

Advanced diagnostics can also include gonioscopy, specialized imaging, angiography, laboratory testing, or testing for systemic disease. Bilateral inflammation, retinal hemorrhage, or other findings may prompt investigation beyond the eyes. The goal isn’t to do the most tests, but to choose those that answer the most relevant clinical questions.

Eye Exams for Exotic Pets Require a Species-Specific Approach

Dogs and cats are not the only animals that can develop eye disease. Rabbits, birds, reptiles, and other exotic pets can develop corneal injuries, conjunctivitis, uveitis, cataracts, tear-duct problems, infections, and other ocular conditions. 

Rabbits, for example, commonly develop corneal ulceration, and eye or tear-duct problems can sometimes be associated with dental disease. A rabbit’s examination may include the face, jaw, oral cavity, and other structures. Safe restraint is also important because rabbits can injure themselves if handled improperly.

Birds require another approach because stress and respiratory status drastically affect how safely they can be handled. Observation before restraint is valuable, and severely ill or stressed birds may need stabilization or modified examination before extensive diagnostic procedures. Eye disease in birds can also accompany broader respiratory or systemic illness.

Reptiles have additional anatomical differences. Snakes have a transparent spectacle covering the eye, which is typically shed with the skin. A retained spectacle or subspectacular disease can affect the eye region. Reptile examination and imaging techniques may need to be modified for the species, body size, anatomy, and handling requirements.

When Does a Pet Need a Specialty Eye Examination?

Persistent redness, squinting, discharge, cloudiness, recurrent eye problems, or unexplained vision changes all warrant a detailed ophthalmic evaluation. A referral may also be recommended for cataracts, glaucoma, retinal disease, complicated corneal ulcers, lens disorders, chronic inflammation, or conditions that are not responding as expected. Specialty equipment can provide detailed information.

Some changes call for urgent care. Sudden blindness, significant trauma, an eye displaced from its normal position, severe pain, rapid cloudiness, or suspected penetrating injury deserve prompt veterinary attention. Do not delay emergency treatment while waiting for a routine specialty appointment.

Your primary veterinarian and veterinary ophthalmologist can coordinate care when ongoing medical treatment is needed. Eye findings can sometimes indicate diabetes, hypertension, infection, inflammation, or another systemic condition. Coordinated care helps address both the ocular disease and any broader medical problem contributing to it.

Medvet has a helpful article that covers common tests used to diagnose eye issues in pets. Tufts University also has a helpful piece on pet eye exams.

Frequently Asked Questions About Eye Diagnostics

What tests are usually performed during a pet eye exam?

A pet eye exam may include vision and pupil response testing, a Schirmer tear test, fluorescein corneal staining, tonometry, a magnified examination of the front of the eye, and/or an examination of the lens and retina. The exact combination depends on your pet’s symptoms, species, medical history, and initial findings.

Additional testing may be recommended when a routine exam doesn’t answer the diagnostic question. Ultrasound, electroretinography, cytology, culture, tear-duct evaluation, or other specialized tests can provide more information. Not every patient needs every available ophthalmic test.

Does a veterinary ophthalmology exam hurt?

Most routine ophthalmic tests cause only minor, temporary discomfort. However, if your pet’s eye is already causing pain, it may be unpleasant. Tear testing, fluorescein staining, pupil assessment, and many pressure tests are quick. Topical anesthetic may be used for procedures that require numbing the ocular surface.

We always prioritize your animal companion’s comfort and safety. Sedation or anesthesia may be recommended for some specialized procedures, painful conditions, or species that cannot be safely examined while awake. The need for sedation is determined on a case-by-case basis.

Why does the veterinarian stain my pet’s eye?

Fluorescein stain helps detect corneal surface damage because the dye adheres to exposed corneal tissue where the protective epithelium is lost. This makes scratches and ulcers easier to identify. The staining pattern can also indicate the depth or integrity of certain corneal injuries.

Fluorescein also has additional ophthalmic uses, including assessing tear drainage in selected cases. Veterinarians interpret the test alongside magnification and the rest of the eye examination. A painful eye may have a corneal defect that is difficult to recognize without staining.

Why does my pet need eye pressure checked?

Measuring intraocular pressure helps veterinarians investigate conditions such as glaucoma and uveitis. Glaucoma is associated with abnormally elevated pressure and can damage the retina and optic nerve. Inflammation inside the eye can also alter pressure. Tonometry provides an objective measurement that cannot be obtained by simply looking at the eye.

Veterinarians interpret the result alongside other findings. Pressure can differ between eyes and can be influenced by ocular disease. Accurate measurement helps the veterinarian decide which diagnoses and treatments to consider.

Can exotic pets receive specialized eye exams?

Yes. Rabbits, birds, reptiles, and other nontraditional pets can receive ophthalmic evaluation, but examination methods must account for species-specific anatomy, behavior, handling needs, and normal test values. We may use different diagnostic tools, depending on the animal and the suspected eye condition.

Exotic eye disease can also be connected to broader health or husbandry problems. Dental disease may contribute to ocular problems in rabbits, while eye abnormalities in birds or reptiles can accompany systemic or environmental issues. A complete history and species-appropriate examination are especially valuable.

Schedule a Pet Eye Exam at Our Providence, RI Veterinary Eye Clinic

A pet eye exam can reveal whether redness, cloudiness, discomfort, or vision changes originate from the cornea, lens, retina, eye pressure, tear system, neurological pathways, or another part of the visual system. Animal Eye Care of New England provides specialty veterinary ophthalmology for pets in the Providence, RI area.

If you are searching for an eye vet near me, a pet ophthalmologist, an animal eye specialist, or a veterinary clinic for an ocular concern, contact the clinic to schedule an examination and learn what may be affecting your animal companion’s eyes.

This article provides general educational information about veterinary ophthalmic diagnostics and does not determine which tests an individual animal needs. Consult your veterinarian or veterinary ophthalmologist for examination, diagnosis, and treatment recommendations tailored to your pet, and seek prompt veterinary care for sudden vision loss, significant eye pain, or serious ocular injury.

Finding the cause of an eye problem may require specialized testing and a close examination of several ocular structures. Animal Eye Care of New England provides advanced veterinary ophthalmic care throughout greater New England, including Boston, MA; Providence, RI; and Bridgeport, CT. Explore our Services page for an overview of available care, including Diagnostics, Exotics Care, Cornea, Lens, and Retina, for more information on specialized evaluations for dogs, cats, exotic pets, and other animals.