How Is Glaucoma Treated?

The main goal of glaucoma treatment is to lower intraocular pressure (IOP) to a target level, slowing or halting optic nerve damage; visual field loss that has already occurred cannot be reversed with current methods.

Treatment follows a stepwise approach: most patients start with pressure-lowering eye drops; laser is considered if the response is insufficient or drops are unsuitable, and surgery when medication and laser fail to control the disease.

In Istanbul, Op. Dr. Anıl Kaya assesses patients with confirmed or suspected glaucoma from their examination findings and determines the appropriate step; early diagnosis and regular follow-up are the strongest predictors of success.

Glaucoma treatment is not a single procedure; it is a stepwise journey that begins with diagnosis and continues with lifelong monitoring. The steps below show the order a patient typically follows — see where your own situation currently sits.

Moving to the next step is never automatic: it happens only when the current step fails to lower pressure enough, or a patient cannot maintain it. Most patients go through only one or two steps, not the full pathway.

Who it is for: Patients diagnosed with, or monitored for suspected, glaucoma who need lower eye pressure.

Duration: Eye drops are used daily; a laser session is short; surgical duration varies by technique.

Anaesthesia: Topical drops or local anaesthesia usually suffice for laser and surgery.

Follow-up: Regular checks of eye pressure and the optic nerve, at intervals depending on treatment type.

As the name suggests, glaucoma treatment is mainly for patients already diagnosed with glaucoma. The most common type, open-angle glaucoma, usually follows a slow, silent course; the less common angle-closure type can raise pressure rapidly, sometimes suddenly. The approach depends on which type is involved.

In some cases of suspected glaucoma — raised pressure with no optic nerve damage yet detected — preventive treatment may start depending on the risk of progression. More on what glaucoma is, how it develops and its possible symptoms is on our glaucoma page.

Treatment is recommended for patients whose pressure remains above target, who have glaucoma-related optic nerve damage, or who carry a risk of progression. Depending on clinical assessment, preventive treatment may also be considered for a family history of glaucoma, high myopia, or other risk factors.

Disease stage affects how intensive treatment needs to be: early-stage, low-risk disease may be managed with a single drop, while advanced damage or clear progression may call for laser or surgery sooner. Which group applies to you can only be clarified through a comprehensive glaucoma examination.

For people whose pressure stays within normal limits with no evidence of optic nerve damage, regular monitoring is usually enough instead of active treatment, avoiding unnecessary medication. Patients with an allergy or systemic restriction affecting certain drugs may be offered a different step instead of eye drops. The method is assessed individually, so a comprehensive glaucoma examination is required before starting treatment.

Before treatment begins, a glaucoma examination assesses intraocular pressure, the optic nerve, and, where needed, the visual field in detail. This confirms the diagnosis and determines the appropriate treatment step. How a glaucoma examination is performed is covered on our glaucoma examination page.

All three steps share the same aim: easing fluid outflow from the eye to bring pressure down to target. Fluid inside the eye (aqueous humour) is produced continuously by the ciliary body, fills the anterior chamber, and drains through the trabecular meshwork at the drainage angle. When this pathway narrows, pressure rises as production continues unchanged; each step eases this outflow by a different route.

Eye drops are used daily to lower pressure; common classes either reduce fluid production or increase drainage through the existing pathway. The choice depends on pressure level, eye structure and other health conditions. Effectiveness is checked at intervals; if one drop is not enough, more may be added or the medication changed.

If the response to drops is insufficient, or drops are unsuitable, laser may be used. A common method in open-angle glaucoma is selective laser trabeculoplasty (SLT), applied to the trabecular tissue at the drainage angle to ease outflow. It is usually quick, outpatient, and can be combined with drops or used first to reduce drop dependence.

When medication and laser fail to control pressure, or disease has advanced, surgery is considered. The shared goal is a new or wider outflow pathway: options include trabeculectomy (a new drainage channel), valved or non-valved tube or shunt implants (a small device directing fluid out of the eye), or techniques within minimally invasive glaucoma surgery (MIGS). The surgeon chooses based on angle structure, response to previous treatment and disease stage.

All three steps share the same goal: easing fluid outflow to reach target pressure. The steps below show the order a patient may follow; not everyone goes through all of them, and moving on happens only when the previous step is insufficient.

1. 1Starting with Eye Drop Treatment. Pressure-lowering eye drops are used regularly every day; effectiveness is checked at set intervals, and if a single drop is not enough, more than one drop or a change of medication may be considered.
2. 2Laser Treatment if the Response Is Insufficient. Selective laser trabeculoplasty, commonly used in open-angle glaucoma, is applied to the trabecular tissue at the drainage angle; the procedure is usually quick and can be performed in an outpatient setting.
3. 3Surgical Assessment if Medication and Laser Are Insufficient. Options such as trabeculectomy, tube or shunt implants, or minimally invasive glaucoma surgery (MIGS) are assessed according to the angle structure, the response to previous treatments and the stage of the disease.
4. 4The Step Is Determined by the Surgeon. Which step is used is assessed individually for each patient according to the current pressure level, the degree of optic nerve damage and the rate of progression.

With eye drops, regular use and attending follow-up appointments matter; missed doses reduce effectiveness and can give a misleading picture of pressure. Recovery after laser is usually short, and patients return to daily life quickly; the first check looks at whether pressure has moved as expected. Recovery and check-up frequency after surgery vary by technique; pressure is monitored closely early on, and some patients show lower or higher pressure than expected, needing adjustment.

Whatever step a patient is on, the process follows the same four stages: treatment begins, the response is measured, it is compared against target, and either the plan continues or the step is reviewed — a cycle that continues indefinitely by the nature of the disease.

Success is assessed by whether intraocular pressure reaches the target level and stays there over time. In most patients, the right step brings pressure under control and preserves existing visual function. However, visual field loss that has already occurred is not reversed; success means halting or slowing progression, not improvement.

This is judged not from a single visit but by comparing measurements over time: pressure is measured regularly, the optic nerve reassessed with OCT and, where needed, the visual field with perimetry. Treatment is successful when pressure stays at target and no new optic nerve change is found against previous records; otherwise, the step is reviewed.

Glaucoma treatment does not reverse vision loss; it only slows or halts progression, so starting early affects the outcome. Not every patient responds equally; some find pressure control difficult and need a change of step.

Eye drop effectiveness falls if regular use is not maintained, and pressure control with laser or surgery may also not last — some patients need further treatment or a repeat procedure over time. Glaucoma treatment is more realistically a long-term process of treatment and follow-up than a one-off procedure.

Eye drops can cause local effects such as redness, stinging or eyelash growth, and some also have systemic effects — discuss your general health with your doctor. Laser can cause a temporary pressure rise or mild inflammation. Surgery carries the risks of any procedure: infection, bleeding, or a pressure drop that is smaller or larger than expected. Frequency and severity vary between patients; your individual risk is assessed in detail beforehand.

If you notice a side effect, report it to your doctor rather than managing it yourself — stopping eye drops on your own because of irritation can cause loss of pressure control. Any change of dose or method should follow assessment at examination.

Op. Dr. Anıl Kaya takes a stepwise, patient-specific approach: a comprehensive glaucoma examination establishes disease stage before treatment, and pressure and optic nerve status are monitored with regular checks throughout. The choice of step is not based on one measurement alone — age, daily routine, capacity to keep up with drop use, and the rate of progression are weighed together, aiming for sustainable pressure control at the lowest risk. More on the doctor and his expertise is on our doctor page.

In glaucoma, 'alternative' usually means a different step within the same disease rather than a treatment for a different condition: laser is considered when drops are insufficient, and surgery when laser proves insufficient. Some patients with early-stage, low-risk disease may be monitored rather than actively treated. Which step suits you is determined by your doctor from your examination findings.

For more information on glaucoma, the glaucoma examination and peripheral vision loss, you can explore our related pages.

Eye drops do not restrict daily life; patients continue work and social activities the same day. After laser, a short rest is usually enough and most return to daily activities the next day. With surgery, recovery and restrictions — such as avoiding heavy lifting or pressure on the eye — vary by technique and are explained individually by the surgeon.

If you have been diagnosed with glaucoma, or told your eye pressure is raised, book an appointment with Op. Dr. Anıl Kaya in Istanbul via our contact page to discuss your treatment options.