What happens during an eye test? A step-by-step guide

For many people, the idea of an eye test feels vague or slightly intimidating. They’re not sure what will happen, how long it will take, or whether it’s simply about getting new glasses. Some worry about being rushed. Others worry about being sold to. Parents often worry about how their child will cope.

In reality, a proper eye test is calm, thorough, and focused entirely on your eye health and visual comfort. This guide walks through each stage, step by step, so you know exactly what to expect when booking an eye test in Barking.

Step 1: discussion about your vision and eye health

Every eye test starts with a conversation. This is not a formality. It shapes the entire examination.

The optician will ask about:

• any changes in your vision
• headaches or eye strain
• screen use
• night driving
• general health
• medications
• family history of eye conditions
• previous prescriptions

For children, this also includes school performance, reading, concentration, and any feedback from teachers.

This discussion helps identify risk factors and ensures the rest of the test is tailored to you rather than being generic.

Step 2: vision checks and visual acuity testing

This is the part most people recognise. You’ll be asked to read letters or identify shapes on a chart, either across the room or through a digital display.

For adults, this checks how clearly you see at:

• distance
• intermediate (screens)
• near (reading)

For children, age-appropriate methods are used. Younger children do not need to know letters or numbers. Picture charts, matching games, and simple responses are all accurate ways of assessing vision.

This stage establishes a baseline and highlights whether further correction may be needed.

Step 3: refraction – determining your prescription

Refraction is the process of finding the precise lens strength that gives you the clearest, most comfortable vision.

You’ll look through a series of lenses and be asked which option looks clearer. The changes are subtle. This isn’t about guessing. The optician guides the process carefully to avoid over-correction.

For children or patients who struggle to respond, objective techniques such as retinoscopy are used. These do not rely on verbal feedback and are highly accurate.

This step ensures your prescription supports long-term comfort, not just sharpness.

Step 4: eye muscle balance and coordination tests

Seeing clearly isn’t just about sharp vision. Your eyes must also work together properly.

These tests check:

• how well your eyes align
• how smoothly they track objects
• how effectively they focus together

Poor coordination can cause headaches, fatigue, double vision, or difficulty concentrating, especially during reading or screen use.

In children, this step is essential for detecting squints or early signs of visual strain that may affect learning.

Step 5: eye health examination

This is one of the most important parts of the eye test and often the least understood.

The optician examines the health of your eyes, including:

• the front of the eye (cornea, iris, lens)
• the internal structures
• the retina
• the optic nerve

Specialist lighting and magnification are used. In some cases, drops may be offered to temporarily widen the pupils, allowing a clearer view of the back of the eye.

This part of the eye test helps detect early signs of conditions such as:

• glaucoma
• cataracts
• diabetic eye changes
• macular degeneration
• retinal issues

Many of these develop without symptoms, which is why regular eye tests matter even if your vision feels fine.

Step 6: eye pressure checks (when appropriate)

Eye pressure measurement helps assess the risk of glaucoma. It is quick and painless.

Not every patient needs this at every appointment, but it is commonly included for:

• adults over a certain age
• patients with family history of glaucoma
• those with clinical risk factors

If pressure readings are outside the expected range, further checks or monitoring may be recommended.

Step 7: discussing the results

Once the examination is complete, the optician explains the findings in clear terms.

This includes:

• whether your prescription has changed
• whether glasses or contact lenses are recommended
• whether your eye health is stable
• whether follow-up or monitoring is needed
• how often you should return for your next test

For parents, this includes reassurance about development and guidance on supporting a child’s vision at school and at home.

Nothing should feel rushed. You should leave understanding your eyes better than when you arrived.

Step 8: advice on glasses or contact lenses (if needed)

If glasses or contact lenses are required, advice is given based on:

• your prescription
• your lifestyle
• work or screen use
• comfort
• durability (especially for children)

There is no obligation to proceed immediately. A proper eye test focuses on clinical need first. Decisions about eyewear should feel informed, not pressured.

For NHS-eligible patients, vouchers and entitlements are explained clearly.

Step 9: booking and aftercare

Finally, you’ll be advised when to return. This varies depending on age, health, and prescription stability.

Aftercare matters. Adjustments, repairs, and follow-up advice are part of maintaining good vision, not extras.

How long does an eye test take?

Most eye tests take around 20–30 minutes. Some may take longer if additional checks are needed. Children’s tests are paced to suit them and are never rushed.

Why understanding the process matters

Knowing what happens during an eye test removes uncertainty. It encourages earlier bookings, improves outcomes, and ensures problems are caught before they affect daily life.

A proper eye test is not just about seeing more clearly today. It’s about protecting your eyesight for the future.