Cataract Surgery in a Monocular Eye 

Dr. Keith Tokuhara, MD

Fellowship-Trained Cataract Surgeon, Desert Vision Center · May 3, 2026

Monocular patients are people who have functional vision in only one eye. The other eye may have been blind from birth, lost to injury, or damaged by a prior condition like a retinal detachment. Whatever the reason, there is only one eye doing all the visual work. And when that eye develops a cataract, that patient faces a decision unlike any other in eye care.

This is not like standard cataract surgery, where a patient has a second eye as a backup. Here, if something goes wrong - if a rare but serious complication occurs - the patient has no vision left to fall back on. That reality changes everything about how the surgery should be planned and performed.

The Highest-Stakes Cataract Surgery

When I say this is the highest-stakes cataract surgery, I mean it precisely. Standard cataract surgery carries a very small risk of serious complications - posterior capsule rupture, retinal detachment, infection, elevated pressure. These risks are low, and for a patient with two seeing eyes, they are manageable. The other eye provides vision while the affected eye recovers or is treated.

For a monocular patient, the same low probability events carry a completely different consequence. There is no second eye. The margin for error is smaller, the psychological stakes are higher, and the preparation must be correspondingly more thorough.

This is why I believe monocular patients deserve a surgeon who specifically acknowledges the stakes, rather than treating the case like any other cataract. The technical steps of cataract surgery are the same. But the thinking before, during, and after must be different.

Harold Baird: Scared Out of His Mind

Harold Baird came to me from Michigan. He had been blind in his left eye since the age of five. In 1982, his right eye - his only seeing eye - suffered a retinal detachment. He survived that. But over the years, a cataract developed in that same eye. The eye that had already been through so much.

He saw three different surgeons before he came to me. He was, in his own words, "scared out of their mind." And he had every right to be. Anyone in his position who is not scared probably does not fully understand what is at stake.

When Harold came to my office, I did something I do with every monocular patient: I took a lot of time. His first exam was 70 minutes. We went through everything. His history, his prior retinal surgery, the state of his eye now, the lens options, the risks, the plan. By the time we finished, Harold said he had run out of questions.

Harold's surgery went very well. He achieved 20/20 or better vision. No astigmatism. He went from minus 4.25 nearsighted to needing no glasses at all. For someone who had been managing with only one compromised eye his whole adult life, that result was life-changing.

Why Dual Fellowship Training Matters

Most cataract surgeons complete a single fellowship in anterior segment surgery. I completed fellowship training that covers both cataract surgery and retinal surgery under Dr. Howard Gimbel at Loma Linda University - one of the most respected cataract training programs in the world.

For most cataract patients, retinal training is not specifically relevant. For monocular patients - especially those who have had prior retinal surgery, retinal detachments, or retained silicone oil - it changes everything. I understand the anatomy, the prior interventions, and the risks from the back of the eye, not just the front.

Harold Baird had a retinal detachment repair in 1982. Understanding exactly what was done, what the current retinal anatomy looks like, and how to protect it during cataract surgery is part of why his outcome was as good as it was.

The Emotional Weight

I want to be direct about something: monocular patients are often terrified. Harold described himself as "scared out of their mind," and that is not an unusual reaction. It is a rational one. When your only eye needs surgery, the fear is proportionate to the reality.

Part of my job - a part I take seriously - is to sit with that fear honestly. Not to minimize it or talk past it, but to give patients the information and the presence they need to make a confident decision. For some patients, that means spending 70 minutes on the first visit. For some, it means multiple consultations before they feel ready.

There is no pressure. The decision to proceed with monocular cataract surgery should be made from a place of understanding and genuine confidence, not urgency. If you leave my office with unanswered questions, I have not done my job.