Macular hole: when the hole in the retina lies in the middle of your vision

Symptoms: warped lines and a grey patch in the centre

A macular hole announces itself exclusively through what you see in the centre of your field of view. The combination of these observations is typical:

• Distorted vision (metamorphopsia). Straight lines ripple or kink: door frames, window bars, tile joints, lines of text.
• A grey or dark patch in the centre. It moves with your gaze — unlike a shadow at the edge, which stays where it is.
• Letters that appear smaller or incomplete. Individual characters are missing from a word, even though the glasses are right and the rest of the line is sharp.
• Reading becomes laborious, while distance vision and your orientation in a room stay unchanged.
• Usually one eye, and often discovered by chance — when covering the other eye, at an ophthalmic appointment or at an eye test.

What is not usually part of a macular hole: pain, a red eye, flashes of light, a shower of floaters or a curtain from the side. These signs point to the peripheral finding described further up — and that one is urgent. If they appear when a macular hole is already known about, that changes nothing: they still count as a peripheral warning sign and need examining the same day.

An emergency that comes before even that: A sudden, complete loss of vision in one eye — particularly together with headache, pain on chewing, difficulty with language or speech, or signs of paralysis — does not belong in our consultation but in an emergency department, immediately: call the ambulance (144). Behind it can be a vascular occlusion or a vascular inflammation, where minutes and hours count. A macular hole does not arise in minutes — what arises in minutes is something else.

The Amsler self-test: the grid that makes distortion visible

The Amsler grid is a square grid of lines with a dot in the middle. This is how you use it: put your reading glasses on if you need them, hold the grid at about half an arm's length, cover one eye, fix the open eye on the central dot — and then, without letting your gaze wander, take in the grid all around it. Wavy lines, a bent field, a grey area or a missing piece are noticeable. Then the other eye, on its own. A grid with instructions is part of what we offer online: the Amsler grid in the free Eye & Lid Check. The check is expressly non-diagnostic and replaces no examination — it helps you notice a change at all and describe it to us more precisely. Conversely, an unremarkable grid is no all-clear: it misses changes and does not replace the check-up.

If the grid looks warped or a spot is missing: Newly distorted or wavy lines and a grey patch in the middle of the picture are not a case for the next free appointment — get in touch about it the same day. That holds before the cause is settled: behind the same signs there can also be wet macular degeneration, and there the window of time is measured in days, not in months. Call us: +41 44 500 69 00 — or book an appointment for a macular assessment. Say straight away that your vision is newly distorted — that is a different piece of information from 'an appointment with the ophthalmologist'.

Stages and progression: from traction on the macula to an open hole

A macular hole does not arise in a moment but over weeks to months. The OCT (optical coherence tomography) makes that course visible: a contact-free cross-sectional image of the retina at microscopic resolution, without radiation and without dye. It shows whether the vitreous is still pulling on the macula, whether the centre of the retina has torn partly or through all its layers, and how wide the defect is. For us the OCT is part of the standard diagnostics of the macula; an overview of the examinations that belong to a full eye check-up you will find separately.

The stages described along the way:

• Traction on the macula (vitreomacular traction). The vitreous has already separated all around, but still adheres in the centre and pulls. First distortions are possible; there is no hole yet. If the traction releases, the finding can settle.
• A tear beginning to form. The centre of the retina gives way; the cross-sectional image shows a gap that does not yet cut through all the layers.
• Full-thickness macular hole. The defect goes through all the layers. The grey patch in the centre is now usually obvious, and spontaneous resolution is rare.
• Hole growing larger, with loosened edges. Fluid collects around the defect and the edges lift. That is the progression the check-up is meant to catch in time.

In the report itself these usually appear as Roman stages I to IV, or as the width of the hole in micrometres, often rendered as small, medium or large. Both describe the same course — the words above are the translation of what can be seen on the OCT image.

Alongside these there are forms that are often only monitored: the lamellar macular hole, in which only part of the layers is missing, and the pseudohole, in which a membrane merely mimics a hole. Both can stay stable for years. Telling them apart from a full-thickness hole on the OCT image is the real value of the examination — because whether an operation should be done at all depends on it.

Two measures count above all for the outlook, and both are in the OCT report: how wide the hole is and how long it has been there. Figures on that belong in the conversation about your own finding, not on a web page — what belongs here is the consequence: anyone who notices warped lines and puts the appointment off by months is putting off more than the diagnosis.

What happens if there is no operation

Many people ask this question, and it is a fair one — not every macular hole has to be operated on, and not everyone wants, or is able, to undergo an operation with days of positioning. What you should know for that:

• A full-thickness hole rarely closes on its own. As a rule it stays open and, over months, gets larger rather than smaller.
• The central vision of that eye stays impaired and can deteriorate further. Reading, faces and screen work are laborious with it.
• Vision of your surroundings is preserved, as a rule. A macular hole does not take the whole visual field — orientation, movement and finding your way remain. One exception is in the last point of this list; it concerns highly short-sighted eyes.
• The other eye compensates for a great deal, as long as it is healthy. That is exactly why the finding is often noticed late — and exactly why checking the fellow eye matters.
• Rare, but relevant: In very long, highly short-sighted eyes the retina can detach starting from a macular hole — which is why pronounced short-sightedness as a risk factor is a reason to monitor the finding more closely.

There can be good reasons against an operation: a hole that has been there a very long time, a fellow eye that sees well, a state of health that makes the positioning impossible, or simply your decision. That weighing up is done by the operating surgeon together with you — on the basis of what the OCT shows. Our job beforehand is to explain the finding to you in a way that lets you answer the question at all.

And the one sentence that ties the two together: waiting is a legitimate decision, but only if it is one. Anyone who puts the appointment off because 'it is manageable somehow' is not deciding — they are letting it be decided.