Most people schedule an eye check up when their vision starts to blur or their glasses stop feeling right. It is an understandable trigger, but it misses the point of what a proper eye examination actually does. Reading a chart is where the appointment begins, not where it ends.
A thorough eye check up screens for conditions that have nothing to do with whether you need a stronger prescription. Glaucoma, macular degeneration, diabetic retinopathy, and hypertensive retinopathy can all be detected through a full eye health check, often years before you notice a single symptom. By the time vision changes become obvious, some of these conditions have already caused irreversible damage.
At EyeQ Optometrists, Cape Town based practices, use advanced ocular imaging and diagnostic technology as part of their standard clinical offering. This article walks you through the stages of the eye examination, how often you should book, what to expect on the day, and what it typically costs in South Africa.
What a comprehensive eye check up actually covers
The difference between a vision screening and a full eye exam
A basic vision screening tells you one thing: whether your eyesight is sharp enough to pass a threshold. A full eye examination evaluates the entire visual system and the health of every structure inside the eye. These are fundamentally different exercises, and conflating them is how serious conditions go undetected for years.
Visual acuity, the familiar eye chart test, is the starting point. From there, a proper eye test moves through refraction to determine your exact prescription, eye coordination and movement testing to identify binocular vision problems, corneal curvature measurement, intraocular pressure screening, and a detailed examination of the retina and optic nerve. Each test builds on the last to form a complete clinical picture.
The full sequence of tests, explained clearly
The appointment begins with a patient history review. Your optometrist asks about your symptoms, current medications, family history of eye disease, and any systemic conditions such as diabetes or high blood pressure. This conversation shapes which tests get prioritised and how results are interpreted, it is a clinical tool, not a formality.
Preliminary tests follow, assessing depth perception, colour vision, peripheral vision, pupil response to light, and how the eyes move and work together. Refraction comes next, where a series of lens comparisons determines the precise prescription for distance and near vision. Keratometry measures the curvature of your cornea, essential for contact lens fitting and for detecting conditions like keratoconus. Tonometry then screens the pressure inside the eye, the primary marker for glaucoma risk. The appointment closes with a thorough external and internal examination of the eye’s structures: the cornea, lens, retina, optic nerve, and blood vessels.
How advanced diagnostics catch eye disease before symptoms appear
Why retinal imaging and OCT change the diagnostic picture
Retinal photography and optical coherence tomography (OCT) allow an optometrist to examine the retina and optic nerve in extraordinary detail. OCT creates cross-sectional images of the retinal layers and optic nerve fibre, capturing structural changes that are invisible to any other method of examination. These baseline images are then compared at each subsequent visit to track changes over time.
What these images can reveal is clinically significant. Incipient glaucoma presents as thinning of the retinal nerve fibre layer, often before any visual field loss is measurable. Macular degeneration appears as structural changes in the macula before central vision deteriorates. Diabetic retinopathy, retinal detachment, and the vascular effects of high blood pressure on the retinal vessels are all identifiable at a stage when intervention remains effective.
Eye pressure testing and the silent nature of glaucoma
Glaucoma is consistently described as the silent thief of sight for good reason. It causes progressive damage to the optic nerve without pain, without obvious vision disturbance, and without warning until a significant portion of peripheral vision has already been lost. Tonometry, which measures intraocular pressure, is a rapid test and one of the most critical components of any sight test or full eye health check.
Elevated eye pressure alone does not confirm glaucoma, and some people develop the condition with normal pressure readings. This is why the pressure test is interpreted alongside OCT results, visual field testing, and optic nerve assessment rather than in isolation. A practice that omits any one of these components is not delivering a truly complete clinical review.
How EyeQ approaches the standard of care in Cape Town
The EyeQ services include eye examinations, eye health assessments, ocular imaging, myopia control, dry eye management, contact lens fittings, check-ups, spectacle repair and manufacture, and laser surgery assessments.
Using high-resolution imaging technology with their OCTS, they capture detailed images & scans of the eye to establish a visual baseline, enabling one to monitor changes over time and detect early signs requiring further care. EyeQ optometrists view this advanced imaging is integrated into their clinical assessments rather than treated as an optional extra,
The difference between an appointment that simply updates your prescription and one that actively supports your long-term vision lies in the equipment used, the time the optometrist spends with you, and the clinical depth of what gets examined. At EyeQ, the aim is a proactive health assessment, not merely a refractive confirmation.
How often you should book an eye check up
General frequency guidelines by age and condition
Many low-risk adults under 40 with no corrective lenses have an eye check up every two years, your optometrist can advise what interval is appropriate for your individual circumstances. From 40 onwards, more frequent examinations are worth considering, because the risk of presbyopia, cataracts, glaucoma, and macular degeneration increases meaningfully with age. South African optometry guidance recommends a vision test at least every two years for adults over 40 as a baseline, with more regular visits for those with identified risk factors.
If you already wear glasses or contact lenses, annual check-ups make practical sense regardless of age. Prescriptions shift gradually, and an outdated correction can cause eye strain, headaches, and reduced visual performance. Catching a change early prevents months of unnecessary discomfort.
Children and why they need exams before they can articulate a problem
Children do not know what normal vision looks like. If they have always seen the world slightly blurred, they have no frame of reference to flag the problem. This is why regular examinations by an optometrist are the only reliable way to detect paediatric vision problems. The first full eye assessment is recommended between ages 3 and 5, with regular check-ups thereafter as advised.
Untreated vision problems in children do not just affect their eyesight. They directly affect reading ability, classroom performance, coordination, and developmental milestones. Amblyopia (lazy eye) and strabismus (eye turn) are both treatable when caught early and significantly harder to correct once the visual system matures.
Diabetes, high blood pressure, and the case for regular eye exams
For people with diabetes, a dilated eye exam every year is the standard recommendation from the point of diagnosis for type 2, or within five years of diagnosis for type 1 diabetes. Diabetic retinopathy is the leading cause of blindness in working-age adults, and it develops without warning. Annual screening is what stands between an early, manageable finding and irreversible vision loss.
High blood pressure damages the small blood vessels throughout the body, including those in the retina. Hypertensive retinopathy can be detected during a full eye health check, sometimes before a patient is aware their blood pressure is causing vascular damage. For anyone managing hypertension, the frequency of dilated eye exams should be guided by clinical risk and the presence of any retinal changes, discuss the appropriate interval with your optometrist or GP.
Warning signs that mean you should not wait
Some symptoms require an urgent optometrist appointment, not a scheduled one. Sudden vision loss, a dramatic increase in floaters, flashes of light, or a dark shadow moving across your visual field can all indicate retinal detachment, a surgical emergency. Severe eye pain accompanied by haloes around lights and nausea can signal acute angle-closure glaucoma. Sudden double vision warrants same-day evaluation.
Contact lens wearers should be particularly alert to eye pain or redness that persists after removing lenses. Bacterial and fungal infections can escalate rapidly and risk permanent corneal damage. If discomfort does not resolve immediately once the lenses are out, remove them, do not reinsert, and see an optometrist the same day.
What to expect on the day of your eye check up
Timing, dilation, and how to prepare
A full eye check up typically takes 30 min on average, depending on the scope of testing and whether specialised assessments such as contact lens fitting are included. Block the full slot and avoid scheduling anything immediately afterwards that requires close concentration, particularly if dilation is part of your examination. Bring your current glasses or contact lenses, a list of any medications you are taking, your medical aid card, and your previous prescription if you have one.
The bottom line on eye health checks
An eye examination is not a formality you schedule when things start going wrong. It is a proactive health decision that can identify glaucoma, diabetic retinopathy, macular degeneration, and other preclinical conditions at a stage when they are still manageable. The logic is straightforward: the conditions responsible for the most significant vision loss are precisely those that progress without symptoms. A regular eye check up remains the only reliable way to find them in time.
A few frequency principles are worth reiterating. Adults over 40 benefit from an annual or biennial check-up depending on their risk profile. Children should have their first eye test before school age. Anyone living with diabetes should schedule a dilated eye exam annually; those managing hypertension should discuss the appropriate frequency with their clinician based on their vascular risk and any retinal findings.
If you are in Cape Town and want a full eye check up that goes beyond reading a chart, EyeQ Optometrists offers the clinical depth and diagnostic technology to make every appointment count. Book online or visit their practices at Canal Walk, Cavendish Square, Tygervalley, or the V&A Waterfront.
