For the majority of people scheduled for cataract surgery, the short answer is that a full preoperative physical probably does not improve your safety. A large Cochrane review covering more than 21,000 cataract surgeries found that routine preoperative medical testing made no difference in complication rates compared with selective or no testing. Yet walk into many surgery centers today and you will still be told to get “cleared” by your primary care doctor within 30 days. The gap between the evidence and everyday practice is wider here than in almost any other surgical setting, and understanding why can save you time, money, and a fair amount of confusion.
What the Research Shows About Routine Testing
The strongest evidence comes from a Cochrane systematic review that pooled data from three randomized trials encompassing over 21,500 cataract procedures. Across those surgeries there were 707 medical adverse events total. Roughly half occurred in patients who had undergone preoperative testing, and half in those who had not. The odds of a complication were essentially identical between the two groups. Most events were cardiovascular and happened during the operation itself, not because of something a blood test or chest X-ray would have caught ahead of time. Routine testing also did not reduce cancellations or improve outcomes after surgery.1PubMed Central. Routine preoperative medical testing for cataract surgery
A separate trial of just over 1,000 patients found the same pattern when looking specifically at visual outcomes. The routine-testing group and the selective-testing group had virtually identical rates of surgical complications (about 20% in each, mostly minor) and no difference in final visual acuity. The cancellation rate was 2% in both groups.2PubMed. Are routine preoperative medical tests needed with cataract surgery? Study of visual acuity outcome
These findings are not new or disputed. Researchers have been publishing them for more than two decades, and the Cochrane review rates the evidence as high-certainty. What is new is the policy landscape catching up to the science.
Why Your Surgery Center Still Asks for One
For years, the Centers for Medicare and Medicaid Services (CMS) required a documented history and physical within 30 days of any procedure performed at a hospital or ambulatory surgery center. Cataract surgery was not exempt, even though it typically uses only local anesthesia and takes under 20 minutes. In 2019, CMS launched its Patients Over Paperwork initiative, which allowed hospitals and surgery centers to set their own policies on preoperative evaluations.3JAMA Ophthalmology. Feasibility of a Risk-Based Approach to Cataract Surgery Preoperative Medical Evaluation
That rule change should have reduced unnecessary visits, but adoption has been slow. A qualitative study of primary care providers found that many were not even aware the regulation had changed. Others noted that surgical facilities continued to send referral forms requesting the same preoperative workup as before, regardless of the updated rules.4BMC Health Services Research. Routine preoperative assessment for cataract surgery is a source of frustration for primary care providers Individual surgery centers may keep the requirement out of institutional habit, fear of liability, or simply because their electronic health record templates have not been updated. The result is a patchwork: some centers have dropped the requirement for low-risk patients, while others still demand a full workup from every person walking through the door.
There is also a gap between what the regulation says and what individual surgeons feel comfortable with. An editorial in the Journal of General Internal Medicine argued that there is no evidence the required history and physical yields a benefit for most cataract patients beyond the screening that anesthesia staff already perform on the day of surgery.5PubMed Central. A Preoperative Medical History and Physical Should Not Be a Requirement for All Cataract Patients But many surgeons still prefer the reassurance of a recent primary care note in the chart, especially for older patients with multiple chronic conditions.
Medications Your Surgeon Genuinely Needs to Know About
If routine lab work and EKGs add little value, there is one part of the preoperative conversation that undeniably matters: your medication list. Two drug categories in particular can cause real problems during cataract surgery, and both are common enough that your surgeon will want to ask about them whether or not you have a formal physical exam.
The first is tamsulosin, sold under the brand name Flomax and prescribed widely for prostate enlargement. Tamsulosin relaxes smooth muscle, including the muscle that controls your pupil. During cataract surgery the pupil needs to stay dilated, and tamsulosin can cause a condition called intraoperative floppy iris syndrome, where the iris billows and constricts unpredictably. This makes the procedure technically harder and raises the risk of complications.6PubMed Central. The floppy iris syndrome – what urologists and ophthalmologists need to know What makes tamsulosin especially tricky is that the effect can persist even years after you stop taking it, likely because the drug causes lasting structural changes in the iris tissue.7PubMed Central. Intraoperative floppy iris syndrome: pathophysiology, prevention, and treatment Your surgeon can take precautions if they know about it in advance, but being caught off guard mid-surgery is a different story.
The second category is blood thinners, including warfarin and everyday aspirin. A systematic review found that patients who continued warfarin through cataract surgery had about three times the odds of a bleeding event compared with those who stopped, but virtually all of those bleeds were minor and self-limiting, with no effect on final vision.8PubMed. Safety of continuing warfarin therapy during cataract surgery: a systematic review and meta-analysis On the other hand, stopping blood thinners carries its own risk. In a large study of cataract patients, the rates of stroke and other clotting events were low across the board, and the absolute differences in risk between people who continued or stopped their blood thinner were minimal.9PubMed. Risks and benefits of anticoagulant and antiplatelet medication use before cataract surgery The current consensus leans toward continuing blood thinners rather than risking a cardiovascular event for the sake of preventing a harmless subconjunctival bruise. But that conversation needs to happen before, not on, the day of surgery.
Blood Pressure, Anxiety, and Staying Still
Cataract surgery under local anesthesia asks something unusual of you: lie flat, stay calm, and keep your eye steady for 15 to 20 minutes while someone operates millimeters away from your retina. For most people this is manageable. For some, it is genuinely difficult, and this is where a preoperative conversation (though not necessarily a full physical exam) has practical value.
Blood pressure can spike during cataract surgery. One study found that about 10% of patients developed intraoperative hypertension. The strongest predictor was not a history of high blood pressure but anxiety, which increased the odds of a spike roughly tenfold. Being over 80 and being female were also independent risk factors.10PubMed. Risk factors for intraoperative hypertension in patients undergoing cataract surgery under topical anaesthesia Anxiety can also trigger tachycardia, hyperventilation, muscle tension, and sweating, all of which can raise intraocular pressure and increase bleeding risk during the procedure.11Psychology Research and Behavior Management. Fear and Anxiety Associated with Cataract Surgery Under Local Anesthesia in Adults: A Systematic Review
Knowing about severe anxiety ahead of time helps the surgical team plan. They might offer a mild oral sedative beforehand, or spend extra time on reassurance and explanations the morning of surgery. For patients who have significant cognitive impairment, cooperation during a local-anesthetic procedure can be unreliable, which creates safety concerns for both the patient and the surgeon.12PubMed Central. Challenges for the cataract surgeon treating people with dementia: a qualitative study exploring anesthetic choices In those cases a preoperative assessment can determine whether general anesthesia is a safer choice, which is a much bigger medical decision requiring genuine cardiac and pulmonary evaluation.
Lying flat is another concern. Conditions like severe kyphosis, orthopnea from heart failure, and certain spinal or neurological disorders can make the supine position intolerable or even dangerous.13PubMed Central. PHACOSIT: A sitting phacoemulsification technique for patients unable to lie down flat during cataract surgery Surgeons can adapt, including performing the procedure with the patient seated, but they need to know about the issue in advance so the equipment and approach are ready.
The Sedation Question
One reason a preoperative check matters more for some patients than others is the type of anesthesia being used. Cataract surgery performed under topical anesthesia alone, meaning numbing eye drops with no IV sedation, has an extremely low rate of systemic adverse events. A study of thousands of cataract cases found that topical anesthesia without IV sedation had an intraoperative event rate of just 0.13%. Adding IV sedatives roughly quadrupled that rate, and layering multiple sedative agents pushed it higher still.14PubMed. Adverse intraoperative medical events and their association with anesthesia management strategies in cataract surgery
If your surgery will involve nothing more than eye drops and perhaps a local nerve block, your systemic medical risk is about as low as it gets in any operating room. If you need IV sedation because of anxiety or inability to cooperate, the risk profile changes modestly, and a closer look at your heart and lung function becomes more relevant. This is another reason a blanket policy requiring the same workup for every cataract patient makes little clinical sense.
Diabetes and the Infection Myth
You might expect that patients with poorly controlled diabetes face a higher risk of infection after cataract surgery, since that is well established for many other surgical procedures. In cataract surgery, the story appears to be different. A large study of more than 190,000 veterans with diabetes who underwent cataract surgery found that preoperative blood sugar control, as measured by HbA1c levels, was not associated with rates of postoperative endophthalmitis, the most feared type of eye infection after cataract surgery. The infection rate was extremely low overall, at 0.08%, and it did not climb with higher HbA1c.15PubMed. Preoperative Glycemic Control and Acute Endophthalmitis after Cataract Surgery in United States Veterans with Diabetes Mellitus
This matters because some facilities use HbA1c cutoffs borrowed from orthopedic or abdominal surgery guidelines to determine whether a patient with diabetes can proceed with cataract surgery. The authors of that study explicitly noted that infection-rate guidelines from non-ophthalmic surgery may not apply to cataract procedures. If you have been told your cataract surgery needs to wait until your blood sugar is better controlled, it is worth asking whether that recommendation is based on evidence specific to eye surgery or a policy imported from a very different clinical context.
What the Unnecessary Testing Actually Costs
The gap between evidence and practice is not just an inconvenience for patients. It is expensive on a systemic level. A study within the Veterans Health Administration found that roughly half of all cataract surgeries were preceded by at least one low-value preoperative test, at a total cost of about $2.6 million. The most common test was an electrocardiogram, performed in nearly 30% of patients, despite no evidence it helps.16JAMA Network Open. Variability and Costs of Low-Value Preoperative Testing for Cataract Surgery Within the Veterans Health Administration
Looking at the broader Medicare population, a study in the New England Journal of Medicine found that in the month before cataract surgery, spending on medical tests was 42% higher and spending on office visits 78% higher compared with the average of the preceding 11 months.17PubMed Central. Preoperative medical testing in Medicare patients undergoing cataract surgery A more recent analysis of commercially insured patients found that up to 42% had an office visit specifically for surgical clearance, and up to 23% had preoperative tests performed. The combined cost was about $4.3 million across that insured population, or roughly $107 to $114 per affected patient. Adverse events were rare and showed no connection to whether someone had received testing.18PubMed. Prevalence and Cost of Routine Preoperative Care for Low-Risk Cataract Surgery a Decade after Choosing Wisely
Meanwhile, the Cochrane review estimated that preoperative testing costs ran about 2.5 times higher for tested patients compared with those who skipped it, with no safety benefit.1PubMed Central. Routine preoperative medical testing for cataract surgery For patients, the costs go beyond money. There is the time off work for an extra doctor visit, the transportation (which can be a genuine barrier for elderly patients), and the anxiety of scheduling another appointment that may feel medically pointless.
Why Your Primary Care Doctor May Be Frustrated Too
If getting a preoperative clearance visit feels like a box-checking exercise, your primary care provider may agree. A qualitative study that surveyed primary care doctors found widespread resentment about the volume of cataract clearance referrals. The prevailing view was that these assessments have no medical necessity for the vast majority of patients and represent a drain on time, effort, and resources that could go toward patients who actually need care.4BMC Health Services Research. Routine preoperative assessment for cataract surgery is a source of frustration for primary care providers Providers also noted that many of the referral forms they receive still reference the old 30-day requirement, suggesting that the 2019 policy change has not filtered down to the people generating the paperwork.
This creates an odd dynamic. Your ophthalmologist’s office sends you to your primary care doctor, who fills out a form and may order a few tests not because they think you need them but because the surgical facility’s form asks for them. The resulting clearance note often adds little to what the anesthesia team will review on surgery day anyway. The Cochrane review data supports this impression: day-of screening by anesthesia staff appears to be just as effective at catching problems that matter.
What Happens After Surgery
A study of more than 34,000 patients at Duke Health found that 1.77% visited an emergency department within 30 days of cataract surgery. The most common reason was not an eye problem. Cardiovascular complaints accounted for about a quarter of those visits, while eye-related complaints made up only about 15%.19PubMed. Younger Age and Longer Case Times Associated With Emergency Department Visits After Cataract Surgery That mix underscores the fact that most people having cataract surgery are elderly and often have other health issues. They may end up in the ER after surgery for reasons unrelated to the procedure. Whether a preoperative physical would have prevented those visits is the key question, and the evidence consistently says no.
When a Preoperative Evaluation Genuinely Helps
None of this means every patient should walk into the operating room without any medical conversation. The research argues against blanket requirements, not against clinical judgment. There are situations where a preoperative visit adds real value:
- IV sedation or general anesthesia: If you cannot tolerate the procedure under topical anesthesia alone, the anesthetic plan changes substantially, and a cardiac and pulmonary review becomes relevant.
- Inability to lie flat: Severe breathing problems, spinal deformities, or neurological conditions that prevent a supine position need to be identified beforehand so the surgical setup can be adapted.
- Medication review: Tamsulosin (current or past use), blood thinners, and certain other drugs require advance planning. This can often happen during the ophthalmology consultation itself rather than a separate visit to your primary care doctor.
- Cognitive impairment: Patients with dementia or other conditions that affect their ability to cooperate during a local-anesthetic procedure may need a different anesthetic approach, which requires input from the primary care team or a geriatrician.
- Unstable medical conditions: Someone actively experiencing chest pain, uncontrolled heart failure, or an acute infection obviously needs medical stabilization first. This is true for any procedure, not specific to cataract surgery.
For the average otherwise-healthy person with a cataract, a focused medication and allergy review at the ophthalmology office, combined with the anesthesia team’s day-of assessment, covers what matters. A full physical exam, EKG, complete blood count, and metabolic panel add cost and delay without changing outcomes.
Pediatric Cataract Surgery Is a Different Story
Everything discussed so far applies to adult cataract surgery, which accounts for the overwhelming majority of cases. Pediatric cataracts are a genuinely different clinical situation. Children require general anesthesia, which carries higher physiological risk and demands a thorough preoperative evaluation. Their anatomy, physiology, and developmental needs differ substantially from adults, and the surgical planning is more complex.20IntechOpen. Preoperative Evaluation of Pediatric Cataracts If your child needs cataract surgery, the preoperative workup is medically appropriate and should not be compared to the adult scenario where the evidence questions its value.