Dry Eye Testing in Surrey: What the Exam Involves

A dry eye test is not one test. It is a short series of checks: a conversation about your symptoms and health, a close look at your eyelids and the surface of your eye, and a few measurements of how your tears are made, how long they last and how well your eyelid glands work. Together they show why your eyes feel dry, which matters because the cause decides the treatment. Below is what each step looks like, what feels like what, and what happens once the results are in.

TL;DR

• A dry eye assessment combines a symptom and health history, an examination with a microscope and dyes, and targeted tests of tear quality, quantity and eyelid glands.
• No single test settles the diagnosis. Clinicians rely on a combination because symptoms and signs often do not match.
• Most tests are quick and comfortable. The Schirmer strip test is the one people tend to remember, and it is not always needed.
• Results guide a personalized plan, from home care to in-clinic treatments such as IPL, LipiFlow and BlephEx.
• Persistent symptoms, vision changes or pain deserve a prompt visit with an optometrist.

Table of Contents

• Why a standard eye exam can miss dry eye
• What happens in a dry eye examination, step by step
• Common dry eye tests at a glance
• Is dry eye testing uncomfortable, and do you need to prepare?
• Why a battery of tests beats a single number
• What your results lead to
• Our perspective on dry eye testing
• When to see someone sooner
• Book dry eye testing in Newton or Guildford
• FAQ
• Sources

Why a standard eye exam can miss dry eye

A routine vision check answers one question: what prescription do you need? Dry eye is a problem of the ocular surface, the tear film and the glands that feed it, and none of that shows up on a letter chart. You can read the 20/20 line and still have burning, grittiness and blurry vision by mid-afternoon.

The Canadian Association of Optometrists lists common symptoms as redness, stinging, burning, grittiness, scratchiness and a sense of something in the eye. Watery eyes can also be a sign, because the eye sometimes floods with tears as a reflex when the surface is irritated. That surprises many people who assume dry eye means no tears at all.

If these sound familiar, ask for dry eye testing specifically when you book, so the appointment is planned with enough time for it. At Look Optometry, our dry eye assessment page explains how to get started.

What happens in a dry eye examination, step by step

The order below is typical of a thorough assessment. Specific tests vary by clinic and by what your history suggests.

1. The history

The exam starts with questions. Published guidance on assessing and diagnosing dry eye describes a detailed history of your eye symptoms and how they developed, followed by a systematic look at vision, eyelids, tears, conjunctiva and cornea.

Expect questions about:

• When symptoms happen: on waking, during screen work, in air-conditioned or heated rooms, in the car.
• General health and medications. The Canadian Association of Optometrists notes that an optometrist asks about both, as well as your home and work environment, before deciding whether further dry eye testing is needed.
• Contact lens wear, past eye surgery, allergies and eyelid problems.
• Your habits: screen hours, sleep, time outdoors, any eye drops you already use.

You may also fill out a short symptom questionnaire. These give a score that can be repeated later, so you and your optometrist can see whether treatment is working.

2. Looking at the eyelids and the surface of the eye

Using a slit lamp, a microscope with a bright adjustable light, the optometrist examines the lid margins, lashes, the openings of the oil glands, the white of the eye and the cornea. They look for redness, debris, crusting at the lash base, swollen or blocked gland openings and any damage to the surface.

This step is also where other causes get noticed. Allergy, eyelid inflammation (blepharitis) and contact lens problems can all feel like dry eye. A 2025 TFOS DEWS III report on diagnostic methodology explains that these conditions overlap with dry eye, and that history plus observation and staining of the ocular surface help identify other or coexisting causes.

3. Dyes and tear stability

A drop of dye, usually fluorescein, is placed on the eye. Under a blue light it highlights the tear film and any dry or damaged spots on the cornea. The optometrist also times how long the tear film stays intact after a blink, known as tear break-up time. A film that breaks up quickly means your tears are not protecting the surface between blinks.

The Canadian Association of Optometrists describes dye-based assessment with a slit lamp as a way to judge tear quality, quantity and distribution.

4. Measuring tear production

The classic test is the Schirmer test. A small paper strip is placed at the edge of the lower eyelid and the optometrist measures how much of it your tears wet over five minutes. The National Eye Institute says numbing drops are used first, so it is more tedious than painful.

A reading above 10 mm after five minutes is often accepted as normal, though a review of diagnostic methods points out that the test is criticized for being invasive and highly variable. That is one reason it is rarely used alone.

5. Tear chemistry and inflammation

Some clinics measure tear osmolarity, which is the concentration of salts in the tear film, or test for inflammation markers such as MMP-9. The same review says point-of-care MMP-9 testing may lead to an earlier diagnosis. It also cautions that osmolarity readings vary and may not always separate people with dry eye from healthy people, which is why these numbers are read alongside everything else.

6. The oil glands

The most common driver of dry eye is a problem with the meibomian glands in your eyelids, which supply the oily layer that stops tears from evaporating. The optometrist may gently press on the lid to see what the glands release, and may use imaging to view gland structure. Missing or shortened glands can show up on these images even when the lids look healthy from outside.

We explain this in more detail on our MGD treatment page.

Common dry eye tests at a glance

Not every patient gets every test. The point is to choose the ones that answer your particular questions.

Is dry eye testing uncomfortable, and do you need to prepare?

Most of it is easy. The slit lamp and imaging involve no contact. The dye stings for a second at most. The strip test is the most noticeable, and numbing drops take the edge off it.

A few practical points make your results more useful:

• Bring a list of medications and supplements, plus the names of any eye drops you use.
• Bring your glasses and your contact lens boxes or prescription details.
• Wear your contact lenses only if you were asked to. Check when you book, since some tests are done without them.
• Avoid starting a new drop the day before without telling us, since it can change what the tear film looks like.
• Do not wear heavy eye makeup, especially eyeliner along the lash line, because we need to see the gland openings.

Plan on a longer visit than a routine exam. Ask when you book.

Why a battery of tests beats a single number

People are often surprised to hear that their tests look fairly normal while their eyes feel awful, or the reverse. Researchers describe this as a disconnect between symptoms and clinical signs. A 2023 academic review on diagnosing severity concludes that a battery of tests is preferred over a single gold-standard measure for accuracy.

In practice that means:

• A normal strip test does not rule out dry eye, especially if your tears evaporate too quickly.
• Gland changes without symptoms still matter, because early treatment protects what is left.
• Strong symptoms with mild signs call for a second look at other causes, including allergy, eyelid disease, nerve-related pain or medication effects.

The diagnostic report mentioned earlier adds that symptoms which do not respond to standard dry eye treatment should prompt a rethink, including systemic or other diagnoses.

What your results lead to

Testing is only useful if it points to a plan. Most plans combine several layers.

At home. Lubricating drops, warm compresses, lid hygiene, adjusting screen habits and humidity. Our at-home therapies page lays out the basics. If you want to start with products, we carry dry eye products, including The Dry Eye Care Kit and Hylo Dual Intense drops.

Nutrition. Some people ask about fish oil. This overview of omega-3 for dry eyes is a reasonable starting point for the question. Talk to your optometrist or doctor before adding supplements, particularly if you take blood thinners or other medications.

In clinic. When blocked or poorly working glands are the problem, treatments directed at them can help:

• IPL (intense pulsed light): light pulses around the eyes aimed at inflammation and gland function.
• LipiFlow thermal pulsation: warmth and gentle massage of the inner lids to help clear blocked glands.
• BlephEx: a precise cleaning of the lid margins to remove debris and buildup.

You can read about each on our dry eye treatment page and see the latest advances in dry eye treatment.

Contact lenses. If you wear lenses, comfort can often be improved by changing material, schedule or fit. See our notes on contact lenses for people with dry eyes.

Our perspective on dry eye testing

Most people come to us after months of trying drops from the pharmacy shelf. Often the drops help for an hour and then stop, because the real issue is the glands in the lids or the stability of the tear film, not a lack of liquid. That is why we test first and treat second.

We look at tear-film analysis alongside the eyelids and the glands, and we explain what we see on screen so you understand your own eyes. Many of these treatments are not offered at most standard optometry offices, so we built our dry eye service to put assessment and treatment in the same place, with a plan written for you rather than a one-size recipe.

One more thing: we would rather you come in too early than too late. Dry eye usually responds best to steady, early care, and it rarely goes away by itself when the cause is gland related.

— Dr

When to see someone sooner

Do not wait for a dry eye appointment if symptoms are severe. Alberta Health Services advises contacting a doctor or nurse advice line if dryness, irritation or tearing persists despite artificial tears, if you notice vision changes, or if recovery is not going as expected. In British Columbia you can reach HealthLink BC at 8-1-1 for advice.

UK clinical guidance from NICE is a useful benchmark for timing: specialist assessment is worth considering when the diagnosis is uncertain, a systemic condition or abnormal eyelid structure is suspected, or symptoms have not improved after about 4 to 12 weeks of treatment. The same guidance calls for urgent ophthalmology assessment for red-flag symptoms or a suspected serious complication. Get urgent care for severe eye pain, sudden vision loss, marked light sensitivity or a red eye after injury or surgery.

Book dry eye testing in Newton or Guildford

We see patients at our Surrey clinics in Newton and Guildford. A visit with us typically covers the history, an examination of the eye surface and lids, tear-film analysis and a conversation about what the findings mean for you. If treatment makes sense, we build a personalized plan, which may include IPL, LipiFlow, BlephEx or home care.

Start with the Eye Comfort Assessment and dry eye treatments, or book a comprehensive exam through our eye exams page. Direct billing details are available on our site, so ask when you book about what applies to your plan.

FAQ

Are there tests for dry eyes?

Yes. Optometrists typically combine a symptom history, a slit-lamp examination, dye to check tear stability, measures of tear production such as the Schirmer strip, and an assessment of the eyelid glands. The exact mix depends on your symptoms and history.

How long does a dry eye assessment take?

It takes longer than a basic vision check, because several tests are involved and the optometrist walks you through the findings. The Schirmer strip alone takes five minutes. Ask the clinic how much time to set aside when you book.

Does a dry eye test hurt?

No, for most people. Dye can sting briefly, and the Schirmer strip feels odd, but numbing drops are used for it. Imaging and microscope examination do not touch the eye.

What is the difference between a dry eye test, assessment and evaluation?

There is no meaningful difference for patients. The terms all describe the same process of finding out whether you have dry eye, what type it is and what is driving it. What matters is that the visit includes the lids, glands and tear film, not only your prescription.

Can dry eye be confused with something else?

Yes. Allergy, eyelid inflammation, contact lens problems and some medications can cause similar symptoms, and they sometimes occur alongside dry eye. Examination and history are how your optometrist sorts them out.

Sources

• Dry Eye (Ocular Surface Disease), Canadian Association of Optometrists
• Assessment and diagnosis: a rational approach
• Diagnosis of dry eye disease and emerging technologies
• Testing for Dry Eye, National Eye Institute
• How Can We Best Diagnose Severity Levels of Dry Eye
• TFOS DEWS III: Diagnostic Methodology
• Dry Eyes: Care Instructions, Alberta Health Services
• Dry eye disease management, NICE CKS
• Omega-3 for Dry Eyes: Does Fish Oil Help?

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• Eye Exams Surrey BC | Comprehensive Eye Care