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Visual field that has already been lost cannot be recovered. That is why early detection and gap-free use of eye drops are decisive — even if you feel nothing.
Green star — medically glaucoma — is not a single disease but a group of eye conditions in which the optic nerve is gradually damaged. The optic nerve carries the images from the eye to the brain. When its fibres are lost, gaps appear in vision — so-called visual field defects. The most important influenceable factor here is an excessively high intraocular pressure.
The insidious part: the most common form of glaucoma does not hurt and causes no complaints for years. The damage begins at the edge of the visual field, where it is barely noticeable because the other eye compensates for the gap. Those affected often only notice something when a large part of the optic nerve fibres has already been irretrievably lost. This is precisely why glaucoma is one of the most common causes of severe visual impairment and blindness — even though it would be readily treatable.
Why does pressure damage the optic nerve? Inside the eye a clear fluid (the aqueous humour) is constantly produced, which nourishes the eye and drains away again. If too much aqueous humour forms or it drains too poorly, the pressure in the eye rises. This pressure weighs on the optic nerve head (the optic disc), where all the nerve fibres leave the eye. Over the years, sensitive fibres are lost there. Because this process is slow and painless, consistent treatment is so important: it can halt the damage but not reverse it.
To understand the treatment, it is worth taking a look at the most important forms. They differ above all in where and how the drainage of the aqueous humour is disturbed — and how quickly this becomes noticeable.
| Form | What happens | Course |
|---|---|---|
| Open-angle glaucoma | The drainage angle is open, but the trabecular meshwork (the "filter") lets too little through | Most common form, insidious, symptom-free for years |
| Angle-closure glaucoma | The drainage angle is too narrow, the drainage can suddenly become blocked | Can present as an acute attack — an ophthalmic emergency |
| Normal-tension glaucoma | Optic nerve damage despite "normal" pressure values — the nerve is particularly sensitive | Insidious, often recognised late |
| Secondary glaucoma | Consequence of other conditions, injuries or medications (e.g. cortisone) | Depends on the cause |
By far the most common is primary open-angle glaucoma. Here the anterior chamber angle — the area where the aqueous humour drains — is anatomically open, but the fine filter (the trabecular meshwork) becomes more resistant over the years: the drainage silts up, so to speak. The pressure rises slowly, the optic nerve is damaged over the years, and those affected notice nothing for a long time.
With angle-closure glaucoma, by contrast, the angle is anatomically narrow. If the drainage becomes completely blocked — for example when the pupil widens in the dark — the pressure can rise dramatically within hours. This is the dreaded acute glaucoma attack, a genuine emergency (see section 9). With normal-tension glaucoma, finally, the pressure is mathematically within the normal range, but the optic nerve is so sensitive that it is nonetheless damaged — here what matters above all is the examination of the optic nerve itself.
The most important point first: the common open-angle glaucoma runs its course over a long period without symptoms. You feel no raised intraocular pressure, have no pain and see sharply at first. This is precisely what makes the condition so dangerous — the damage occurs unnoticed.
Why is the loss noticed so late? Because it begins at the outer edge of the visual field. A visual disturbance at the edge is barely perceived: the brain fills in the gaps, and the other eye compensates for them as well. Only when the defects become large and move towards the centre do those affected notice that something is wrong — but by then a great deal of optic nerve tissue has already been lost.
If any complaints occur at all, they are often non-specific or appear only late:
Important: the absence of symptoms does not mean that everything is fine. A symptom-free glaucoma still continues to damage the optic nerve. That is why regular ophthalmic check-ups — especially from middle age and in the case of a family predisposition — are the only reliable way to detect glaucoma early.
With the common primary open-angle glaucoma, no single cause can usually be identified. A raised intraocular pressure is the most important influenceable factor — but not the only one. Some people develop damage despite normal values, others tolerate higher values without consequences. What is decisive is the interplay between pressure and the individual sensitivity of the optic nerve.¹
A secondary glaucoma arises as a consequence of other problems — for example after eye injuries, with severe inflammation in the eye, with advanced diabetes or through certain medications. If the underlying cause is treated, the pressure can often improve again. That is why the assessment always includes the question of pre-existing conditions and medications.
Glaucoma cannot be pinned down to a single value. The ophthalmologist combines several examinations to assess pressure, optic nerve and visual field together. A high pressure alone is not yet glaucoma, a normal pressure does not rule it out — only the overall picture counts.¹,²
Because the early stages are symptom-free, specialist societies recommend regular preventive examinations with the ophthalmologist from about the age of 40 — earlier in the case of a family predisposition or severe short-sightedness. If glaucoma is diagnosed, what matters subsequently is above all monitoring the course closely over the years: whether the treatment is sufficient only becomes apparent when several visual field and optic nerve findings are compared over time.
The goal of every glaucoma treatment is to lower the intraocular pressure sufficiently to protect the optic nerve. In the vast majority of cases this begins with pressure-lowering eye drops. They are effective, well studied and usually well tolerated — but only if they are used continuously and reliably. This is precisely where the real problem of glaucoma therapy lies: because you feel neither the high pressure nor the effect of the drops, care slackens over time. Studies show that many of those affected use their drops irregularly or incorrectly — and the damage then progresses, even though a medication has been prescribed.¹
That is why it is worth learning the correct way to instil drops properly once. With a few simple steps, more active substance reaches where it is needed, and less enters the body via the mucous membranes:
There are several classes of active substance that lower the pressure in different ways — partly by improving the drainage of the aqueous humour, partly by throttling its production. Which one suits you depends on the pressure level, tolerability and accompanying conditions:¹
If a single preparation is not sufficient, active substances are combined — often conveniently as a combination drop with two active substances in one bottle, which simplifies use. Side effects are no reason to quietly stop: often a change of preparation or a preservative-free variant already helps with irritated eyes.
brite reminds you of every drop and documents application and check-up appointments without gaps — ready for your next appointment with the doctor.
If eye drops are not sufficient, are not tolerated or reliable use is difficult, there are effective alternatives. They do not always replace the drops, but often supplement them.¹,²
Important to know: all these procedures aim to lower the pressure and protect the optic nerve. They do not bring back vision that has already been lost. That is why the same basic principle applies to all forms of therapy — the earlier the pressure is controlled, the more vision is preserved. Unlike grey star, whose operation makes vision clear again, green star is always about preservation, not restoration.
Glaucoma is a chronic condition that is managed over years and decades. Well treated, vision is preserved into old age in the vast majority of people. Two things are decisive: the reliable daily use of the drops and the regular check-ups, at which it is verified whether the treatment is sufficient.
Many of those affected ask whether they can do something wrong in everyday life. For the common open-angle glaucoma there is reassurance: upside-down exercises, coffee or screen work are not relevant dangers. By far the most important "everyday measure" is banal and at the same time the most difficult — to instil drops reliably every day, even when you notice nothing. This is precisely where fixed routines and reminders help.
Record in brite when you use which drops, and let yourself be reliably reminded — for a stable course over the years.
The acute glaucoma attack is the dramatic exception to the otherwise insidious course. It arises in angle-closure glaucoma, when the drainage suddenly becomes completely blocked and the intraocular pressure rises extremely within hours. This is an ophthalmic emergency: without prompt treatment, permanent damage up to blindness of the affected eye threatens within a short time.
Glaucoma is not treated in weeks but over years — usually with daily eye drops. The therapy only works if it runs reliably and the check-ups stay in view. This is exactly what brite supports.
