When Should Cataract Surgery Be Performed? How Is the Decision Made?

Most people who are diagnosed with cataracts during an eye exam end up asking the same question: Do I need to have surgery right away, or can I wait? There is no single answer to this question, but it’s not entirely unclear either. The criteria that guide the decision are well-defined.

What causes confusion are two conflicting pieces of advice that have been circulating for years. On the one hand, people are told to “wait for the cataract to mature”; on the other hand, they’re told, “Don’t delay—the risk increases.”.

Below, we explain under what circumstances a "wait-and-see" approach is reasonable and under what circumstances it is risky; the factors that influence this decision; and how the choice of an intraocular lens relates to this decision.

Straight Answer: There is no single visual acuity threshold for cataract surgery. The decision is based not on the degree of clouding in the lens, but on the extent to which vision impairs the person’s daily life. If vision is adequate, it is reasonable to wait. If driving, reading, or safe mobility are affected, or if the condition prevents the monitoring of another eye condition, postponement is not recommended.

What factors determine the decision to undergo cataract surgery?

The decision combines two pieces of information: the findings observed by the eye doctor during the examination and the patient’s expectations regarding their vision. Neither of these two factors alone is sufficient.

The objective part of the examination consists of measurable findings. Visual acuity, the type and severity of lens opacity, intraocular pressure, and the condition of the fundus are the primary findings. The personal aspect, on the other hand, is the part that cannot be measured but is just as decisive: what kind of work the person does, whether they drive at night, how much reading is a part of their daily life, and whether they live alone. The same level of vision may cause no problems for one person but represent a serious limitation for another. Symptoms and Diagnosis of Cataracts This is the starting point for this assessment.

“Is ”waiting for the cataract to mature” the right approach?

No, this approach is outdated. It stems from older surgical techniques in which the lens was removed in its entirety; at that time, the process of lens hardening made the procedure technically easier.

In the method used today, the lens is fragmented and removed through a small incision. In this technique, a hardened lens is a disadvantage rather than an advantage; an excessively hard lens requires more energy, prolongs the procedure, and increases the likelihood of temporary swelling in the eye’s transparent front layer. Thus, the technical rationale underlying the old recommendation no longer applies.

For this reason, the decision to “wait” does not mean waiting for the lens to mature. The issue isn’t that the lens hardens; it’s that vision becomes so impaired that it truly makes a person’s life difficult. The fact that two different conditions are referred to by the same term is the main source of misunderstanding that causes patients to wait unnecessarily for years.

Situations in which it is reasonable to wait

The presence of a cataract alone is not an indication for surgery. Mild clouding detected during an examination can be monitored with regular follow-ups if it does not significantly affect vision.

The following scenario clearly indicates when a decision to wait can be made: the person can read, has no difficulty driving, is not bothered by glare in daily life, has no other eye conditions, and their vision can be adequately corrected with glasses. Under these conditions, there is no measurable benefit to rushing the decision. The follow-up interval is determined by the physician, and the process is monitored.

Just because waiting is reasonable doesn’t mean the process should be left to run its course. The decision to wait in cases of cataracts is always a decision to monitor the condition, and someone who stops going for checkups hasn’t “waited”—they’ve let the process slip through the cracks.

Situations Where Postponement Carries Risks

Procrastination isn't always harmless. In some cases, waiting doesn't just result in a loss of comfort—it creates a measurable risk.

The first group relates to safety. Difficulty driving at night due to glare, being unable to distinguish steps when going up or down stairs, and an increased risk of falling in older adults fall into this category. Since vision loss increases the risk of falls and injuries, waiting here poses a direct safety concern.

The second group relates to the eye itself. A severely advanced and swollen lens can affect the circulation of intraocular fluid, leading to increased pressure and eye pain. In addition, a severely clouded lens can interfere with the examination of the back of the eye. In such cases, any problem affecting the retina may go undetected for a longer period of time.

The third group relates to comorbidities. A person with diabetes requires regular monitoring of the retina, and if a cataract begins to interfere with this monitoring, that is a reason to bring the timing of the procedure forward; the same applies to monitoring intraocular pressure.

The six factors that determine the decision

The timing of surgery is not determined based on a single criterion. Several interrelated factors are evaluated together, some of which are derived from the examination and others from the patient’s own account. The table below summarizes the factors included in the evaluation and the direction each one indicates.

Axis	A situation that supports waiting	A situation that brings the timing forward
Impact on daily life	Reading, driving, and movement are not affected	One of these functions is significantly restricted
Visual acuity	It can be corrected to an adequate level with glasses	There is a loss of vision that cannot be corrected with glasses
Glare and night vision	No specific complaints	Driving at night is unsafe
Rate of progress	There are no changes to the controls	There has been significant progress in a short period of time
Visibility of the fundus	The network layer can be easily evaluated	Clouding impedes fundus examination
Comorbid condition	No other eye conditions	Monitoring for diabetes or glaucoma is being neglected

The axes in the table do not all have to point in the same direction. In practice, most decisions involve a mix of waiting and taking a proactive approach, and the physician determines the appropriate balance.

The axis with the highest weight is usually listed first. The extent to which vision impairs daily life is a more decisive factor than all other findings. The goal of surgery is not to correct a specific measurement but to restore the person’s function. For this reason, even if the same visual acuity is measured in two people, the decision may differ.

How do the risks associated with the surgery factor into the decision?

Cataract surgery is a well-established and widely performed procedure, but like any surgical procedure, it carries a certain degree of risk. The way this risk is factored into the decision-making process is often misunderstood.

The mere presence of risk is not, in and of itself, a reason to postpone surgery. The decision is made by comparing the risk associated with the procedure to the risk of waiting; in cases where vision severely limits daily life, waiting itself poses a risk. The presence of a concomitant eye condition, advanced age, or a cataract that has been left untreated for a long time can alter this balance. Asking your doctor during your exam how this balance is assessed for your specific eye is the most practical step toward understanding the decision.

Common Mistakes

It is common for the choice of intraocular lens to be left until the day of surgery. However, the appropriate lens is determined based on preoperative measurements of the eye and the patient’s visual needs. If this discussion does not take place during the decision-making process, the choice may be made hastily, and the outcome may not meet expectations.

Situations That Require Seeking Medical Attention Without Delay

The following findings are not part of the normal course of cataracts and should be evaluated without waiting for an appointment:

• If your vision has suddenly deteriorated over the course of a few hours or a few days
• If you have eye pain, noticeable redness, or a headache accompanied by nausea
• If a patient describes a curtain-like obstruction or a dark spot in part of their visual field
• If you notice sudden flashes of light or a sudden increase in the number of flying objects,
• If double vision begins when looking with both eyes
• If a person with diabetes experiences a sudden, significant decline in vision

Does the decision regarding the choice of an intraocular lens affect the timing?

It does not directly affect vision, but it is part of the decision-making process. When the natural lens is removed, an intraocular lens is implanted in its place, and the type of this lens determines what the vision will be like after surgery.

Lens selection is not a technical choice, but a lifestyle decision. This choice is determined by the distance at which the person most needs to see clearly, whether they drive at night, whether they find wearing glasses uncomfortable, and whether they have any other eye conditions. This decision is discussed during the decision-making process, not on the day of surgery.

Not every type of lens is suitable for every eye. Certain types of lenses are not recommended in cases of retinal disease, severe elevated intraocular pressure, irregular astigmatism, or significant dry eye.

Reimbursement coverage may also vary depending on the type of lens. For up-to-date coverage information, you should consult the relevant institution and your doctor; since this information changes over time, it would not be accurate to make a general statement.

Single-focus lenses

These are lenses that focus on a single distance and are typically prescribed for distance vision. They provide predictable results in terms of image quality and contrast sensitivity.

Most people who undergo surgery with these lenses wear glasses for close-up work and reading. For those who don’t mind wearing glasses, this is a standard option. The fact that it has been in use for many years increases the predictability of the outcome.

Multi-focus and extended-focus lenses

These are lenses designed to provide clear vision at multiple distances. The goal is to reduce the need for glasses.

With these lenses, some people may report seeing halos around light sources at night or experiencing glare. There may also be some change in contrast sensitivity. These symptoms usually subside over time for most people, but they may remain bothersome in certain occupations or situations.

Therefore, this is not a matter of ranking lens types by superiority, but rather a question of suitability. The right choice may differ for someone who drives at night for long periods versus someone who works in close proximity to objects, and the decision is made based on the findings of the preoperative examination.

Lens Selection in the Presence of Astigmatism

For individuals with significant astigmatism, lenses designed to correct astigmatism may be considered. This decision is based on preoperative eye measurements and depends on the degree of astigmatism and whether it is regular or irregular.

If there are cataracts in both eyes, which one is operated on first?

The eye with the more severe vision impairment is usually treated first. Both eyes are not operated on during the same session; planning for the second eye is done after the healing process of the first eye has been monitored.

There is a practical reason for this order. The results from the first eye help ensure the accuracy of the measurements and lens selection for the second eye. Additionally, since the person continues to see with one eye during this process, their daily life is not disrupted.

Does the timing change if I have diabetes or glaucoma?

It may vary. If there is a concomitant eye condition, the decision regarding cataract surgery is based not only on visual acuity but also on the management of that condition.

People with diabetes need to have their retinas evaluated regularly. When cataracts begin to interfere with this evaluation, the timing of the evaluation may be brought forward, even if vision has not yet been significantly impaired. Type 2 diabetes This is why eye examinations are tracked under a separate heading, and this tracking internal medicine is carried out in conjunction with the assessment.

The same applies to people with high eye pressure. Glaucoma Follow-Up Since the diagnosis is based on an evaluation of the visual field and the optic nerve, the fact that cataracts make these examinations more difficult is a factor influencing the decision.

What factors are considered before a decision is made to perform surgery?

Once the decision has been made, a series of measurements and examinations are performed prior to surgery. The purpose of these is both to confirm that the eye is suitable for surgery and to accurately calculate the lens to be implanted.

The ocular portion of the evaluation includes a detailed examination, measurement of intraocular pressure, examination of the fundus, and measurement of the eye. Eye measurement is the step that allows for the calculation of the power of the lens to be implanted. Whether the result is close to expectations depends largely on the accuracy of this measurement.

Medications used for general health, the use of blood thinners, the management of chronic conditions, and, if necessary, an anesthesia evaluation are reviewed. Keeping blood sugar and blood pressure under control during the preoperative period directly affects the recovery process.

These two factors are not independent of one another. An uncontrolled chronic disease can delay the timing of cataract surgery, even if the eye-related findings are appropriate; conversely, bringing a chronic disease under control can speed up the decision-making process. For this reason, the timing of cataract surgery is determined not only by an eye exam but also by the person’s overall health status.

Frequently Asked Questions

Is it necessary for vision to deteriorate to a certain level before undergoing cataract surgery?

No. The fixed visual acuity threshold approach, which has been used for many years, is no longer considered the sole determining factor today. The decision is based on both the measured value and the individual’s difficulties in daily life.

Does the surgery get more difficult the longer I wait?

In cases of very advanced cataracts, the procedure may become technically more challenging, and the recovery process may take longer. For this reason, it is not recommended to wait indefinitely. However, a reasonable waiting period in the early stages does not carry this risk; what matters is not the act of waiting itself, but how long it lasts and whether follow-up care is provided during that time.

I postponed my cataract surgery—will my vision return?

Vision loss caused by cataracts can be restored by replacing the lens. However, if part of the vision loss is due to another eye condition, the same may not apply to that portion. This distinction can only be made through an eye exam.

Will I need to wear glasses after the surgery?

This depends on the type of lens implanted and the postoperative measurements of the eye. Most people who have a monofocal lens implanted wear glasses for near vision. It cannot be guaranteed that any type of lens will make you completely independent of glasses.

If I have cataracts in both eyes, can I have both eyes treated on the same day?

In cataract surgery, it is not standard practice to operate on both eyes during the same session. The second eye is scheduled after the healing of the first eye has been monitored.

How often should I go for follow-up visits after surgery?

The follow-up schedule is determined by the doctor based on the individual and the condition of the eye. The general approach is to schedule the first follow-up shortly after the procedure and then gradually extend the intervals as recovery progresses. If glasses are needed, a period of time is allowed for the prescription to stabilize; for this reason, new glasses are generally not prescribed in the first few days.

Can I get a second opinion before deciding on surgery?

You can do that, and it’s a reasonable approach. It is the patient’s right to seek a second opinion regarding surgical decisions; bringing your previous examination records and test results with you during this process will make the evaluation easier.

Once a decision has been made, how does the process proceed?

Once the decision to undergo surgery has been made, the process is generally not limited to a single day. Pre-operative evaluations, the day of the procedure, and post-operative follow-ups are three interconnected stages.

The procedure usually does not require an overnight stay, and the patient returns home the same day. Anesthesia via eye drops is a common practice; the choice of anesthesia method depends on the patient’s overall health and the specific characteristics of the eye. This assessment is performed as needed anesthesia and resuscitation It is done together with the unit.

The most important period is the one that follows. Vision does not clear up immediately, and blurred vision is an expected symptom during the first few days. Regular use of eye drops, avoiding rubbing the eyes, and attending follow-up appointments are the key points during this period. Increased eye pain, noticeable redness, or a recurrence of blurred vision, however, are not expected symptoms and should be evaluated without delay.

Questions to Ask Your Doctor

When discussing timing, asking this question will help clarify the decision:

• In which eye is my cataract more advanced, and on which axis am I currently at the threshold?
• If I wait, what might change by the time of my next checkup?
• Can the back of my eye be examined easily right now?
• Which types of lenses are suitable for my eyes, which ones aren't, and why?

The Real Question to Ask When Making a Decision

The decision on when to treat cataracts is based less on the question “How advanced is it?” and more on “How much is it limiting me?” Examination findings answer only half of this question; the other half comes from the information the person provides about their own life.

That’s why it helps to describe the specific situations where you have difficulty when you go for an eye exam. Details such as at what distance you have trouble seeing, what happens when you drive at night, and whether or not you’ve stopped reading are the most critical factors in making a decision. This information can only be obtained from you.

Ophthalmology at Sana Medical Center

The Ophthalmology Unit conducts follow-up care for patients diagnosed with cataracts, including a detailed eye examination, visual acuity testing, intraocular pressure assessment, and fundus examination. For patients with comorbid conditions such as diabetes and glaucoma, follow-up care can be planned in collaboration with the relevant departments. For the scope of the unit: Eye Diseases You can view the page and check the days and hours of operation Contact You can access it from the page.