Arboleda Ortiz, an inmate on federal death row in Terre Haute, Indiana, is before us for the second time, suing under Bivens v. Six Unknown Named Agents of Federal Bureau of Narcotics, 403 U.S. 388, 91 S.Ct. 1999, 29 L.Ed.2d 619 (1971). He argues, as he did in his first appeal, that Dr. Thomas Webster, the prison’s medical director, was deliberately indifferent to his *732need for eye surgery. We originally reversed the district court’s grant of summary judgment on the ground that Ortiz had established fact disputes on the seriousness of his condition and the constitutionality of Dr. Webster’s delayed response. Ortiz v. Bezy, 281 Fed.Appx. 594, 598-99 (7th Cir.2008). The record changed very little on remand, yet the district court granted Dr. Webster’s renewed motion for summary judgment. Because the evidence remains insufficient to eliminate the fact disputes that we previously identified, we vacate that decision and remand with instructions that the case proceed to trial.
We assume familiarity with the facts set forth in our first decision. Ortiz, 281 Fed. Appx. at 595-97. Nonetheless, we summarize them here both to illustrate the dispute that has existed since Ortiz filed suit and to demonstrate how the additions to the record on remand merely make that dispute more pronounced.
Shortly after Ortiz was placed in custody in Terre Haute in 2001, a physician determined that he needed eye surgery. Ophthalmologist Jonathan McGlothan examined Ortiz and diagnosed him with pterygia, which is a thin film that covers the eye. Although the condition is often confined to the white part of the eye, Dr. McGlothan noted that it had extended over Ortiz’s corneas and that his uncorrected vision was 20/80 as a result. Ortiz complained that, in addition to obscuring his vision, the pterygia caused persistent itching and irritation, and that he often felt like sandpaper was in his eye. Dr. McGlothan described the pterygia as “visually significant,” prescribed glasses, and recommended excision. Six months later (but before Dr. Webster became medical director), the prison rejected the request. The note “NO TOWN TRIPS” was handwritten on the recommendation.
Over the next two years, Ortiz continued to complain about his eyes. Two more doctors agreed with the original opinion that surgery was necessary, but the prison still refused the treatment. First, Dr. David George signed off on Dr. McGlothan’s recommendation for surgery. Then Dr. D.W. Conner, an optometrist, observed that Ortiz’s vision had deteriorated to 20/100 and that the pterygia was “causing corneal distortion.” Dr. Conner therefore also recommended excision and referred Ortiz back to Dr. McGlothan for surgery. But another optometrist, Dr. Christian Radaneata, thought the condition not sufficiently serious to require surgery and instead prescribed eyedrops and a topical anti-inflammatory.
In May 2003, Dr. Webster, now the prison medical director for about a year, became personally involved in Ortiz’s treatment. He reviewed the file containing the opinions of three doctors that surgery was necessary and one that it was not. Based on this information, Dr. Webster then reached his own opinion about Ortiz: with uncorrected vision of 20/100, Ortiz “may need surgery within the next two years.” To determine whether Ortiz needed surgery, Dr. Webster decided that further evaluation was needed. Although Ortiz saw a specialist at times over the next two years, as far as the record shows his visual acuity was never measured, and he was not evaluated for further corneal distortion despite his continued complaints of redness and irritation.
In a declaration that he furnished in this litigation, Dr. Webster explains that he refused to order surgery in this two-year period as not “medically necessary” because the doctors who had previously examined Ortiz determined that the pterygia was not affecting his vision. But the medical record that Dr. Webster says he consulted contradicts his description of the *733examining doctors’ conclusions. Ortiz’s medical file shows that all the doctors who examined him found the pterygia had impaired his vision (Dr. Webster himself knew in May 2003 that Ortiz’s vision had deteriorated to 20/100), and the majority of specialists added that it had encroached on the visual axes of his eyes.
Ortiz filed this suit two years later, in 2005, to obtain the surgery and damages for the delay. Over the next three years, with three more specialists urging excision (beyond the three doctors who had recommended it starting in 2001), Ortiz received surgery in stages. In July 2006, on Dr. Webster’s request, Ortiz saw an optometrist who noted that the pterygia was continuing to encroach on Ortiz’s corneas (as it had been for years) and recommended surgery. Ortiz then went to an ophthalmologist, Dr. Padma Ponugoti, who noted that the pterygia was causing irritation and needed to be removed. A few months later Dr. Ponugoti performed surgery on Ortiz’s left eye. The follow-up that Dr. Ponugoti ordered, however, including similar surgical treatment of Ortiz’s right eye, was delayed for over a year. Ortiz finally saw Dr. Robert Deitch in March 2008, and he recommended that the pterygia in Ortiz’s right eye be removed and that he undergo an additional procedure in both eyes to prevent it from returning. The prison rejected that recommendation in May 2008, but Ortiz got the surgery in June 2008, two weeks after our initial remand.
In this lawsuit, Ortiz asserts that delay in his treatment was based on deliberate disregard of his documented medical needs. He attributes the indifference to an unofficial prison policy of denying off-site medical care based on an inmate’s death-row status. As circumstantial evidence of this policy, he points to the “NO TOWN TRIP” notation on his chart and to affidavits from other death-row inmates attesting that neither they nor anyone they knew left the facility for medical care between 2001 and 2005.
In our initial decision, we rejected the district court’s grant of summary judgment, identifying two genuine fact disputes. We first noted that, “because most of the doctors — including specialists — who examined Ortiz recommended surgery,” there was a fact question as to the seriousness of Ortiz’s condition. Ortiz, 281 Fed. Appx. at 598. Second, we explained that the rationale Dr. Webster advanced during the litigation for denying surgery (Ortiz’s vision was not impaired) was an inaccurate representation of the medical record that he had consulted; we concluded that this gap in reasoning created a fact dispute on the motivation behind Dr. Webster’s prolonged refusal to provide surgery. Id. As for the “NO TOWN TRIP” note, we described it as “unexplained” and said that, viewed in Ortiz’s favor, it added to the facts already in dispute on deliberate indifference. Id.
On remand, Dr. Webster added two notable items of evidence. First, he explained the “NO TOWN TRIP” notation in a supplemental affidavit and with a declaration from Debi Lamping, its author. Lamping attested that she made the notation on Ortiz’s chart after the initial surgery request was denied and that she merely meant that outside medical care, a “town trip,” had been denied for Ortiz. She denied knowledge of a policy that would foreclose off-site medical care for death-row inmates. In his own affidavit, Dr. Webster attested that some inmates had received off-site medical treatment during the relevant time period and that all inmates receive the same level of care regardless of their security status.
The other piece of new evidence came in the form of an expert opinion supplied by Dr. Raj Maturi, a non-treating ophthalmol*734ogist. He opined that surgical removal of pterygia “is generally an elective procedure” that does not become necessary “until corneal distortion occurs.” He added that, in his view, Dr. Webster’s treatment for Ortiz was “within the standard of care at all times” because the pterygia was “mild” and did not require excision until 2006 when Ortiz’s vision “dropped” to 20/80 without correction. Instead, Dr. Maturi concluded that the doctors who had recommended surgery acted outside of the standard of care because they did not attempt to treat the condition with “medical intervention” (eyedrops) first. That treatment, Dr. Maturi concluded, was sufficient to respond to Ortiz’s condition.
The district court considered this new evidence and again granted Dr. Webster’s motion for summary judgment. The court concluded that Ortiz’s pterygia “certainly reached the stage of a serious medical condition,” but it repeated its initial conclusion that “at best” the evidence illustrated a difference of opinion about the proper course of treatment.
Ortiz argues on appeal that the district court misconstrued his case as reflecting a mere difference of opinion between alternative, equally valid courses of treatment. Instead, he maintains, the evidence viewed in his favor shows that Dr. Webster deliberately or recklessly delayed in providing him with necessary care for a serious medical condition. Ortiz also contends that from 2001 to 2005 the prison implemented an unconstitutional policy of forbidding death-row inmates from receiving off-site medical care. Dr. Webster denies that Ortiz’s pterygia was “objectively serious” and argues that, even if serious, a jury could not conclude that he consciously disregarded it. He relies heavily on Dr. Maturi’s opinion that Ortiz received treatment within the standard of care, but he also maintains that his case doesn’t turn on Dr. Maturi’s view because Ortiz has merely shown that doctors disagree about how to treat pterygia. Finally, Dr. Webster characterizes the “NO TOWN TRIP” notation as mundane shorthand that, when viewed in context, is not evidence of an unconstitutional policy of denying off-site medical care to all death-row inmates.
To survive summary judgment on his claim of deliberate indifference, Ortiz needed to provide evidence that his pterygia constituted an objectively serious medical condition and that Dr. Webster was aware of the condition and knowingly disregarded it. See Farmer v. Brennan, 511 U.S. 825, 837, 114 S.Ct. 1970, 128 L.Ed.2d 811 (1994); Duckworth v. Ahmad, 532 F.3d 675, 679 (7th Cir.2008). Dr. Webster argues that the objective element of this standard is not satisfied, but that contention can easily be rejected. Although pterygia can be treated without surgery unless it begins to interfere with a patient’s vision, it falls into the category of objectively serious once it becomes obvious to a layperson or “has been diagnosed by a physician as mandating treatment.” See Roe v. Elyea, 631 F.3d 843, 857 (7th Cir.2011) (internal citation and quotation marks omitted). Here, the pterygia was interfering with Ortiz’s vision, and most doctors who examined him recommended surgery and all prescribed some form of treatment. At a minimum, those recommendations are enough to create a genuine fact dispute that his pterygia had become objectively serious.
The real issue, then, is whether Dr. Webster intentionally or with deliberate indifference ignored the condition. The evidence here, when viewed in Ortiz’s favor, is sufficient for a jury to conclude that he did. Dr. Webster relies heavily on Dr. Maturi’s affidavit, but we don’t think his opinion helps Dr. Webster’s case. Dr. Maturi opines that, in general, excision of pterygia is unnecessary unless the pa*735tient’s uncorrected vision is 20/80 and the pterygia encroaches on the patient’s corneal axis. Construing the record in Ortiz’s favor, Dr. Webster knew (or recklessly failed to know) that those conditions existed by 2003, when he first examined Ortiz’s file. By that time Dr. McGlothan had observed (two years earlier) that Ortiz’s vision without glasses was 20/80, and Dr. Conner reported that Ortiz did suffer from corneal distortion in 2003. If anything, Dr. Maturi’s opinion supports Ortiz’s contention that he needed surgery and casts doubt on the lone opinion to the contrary.
Moreover, we disagree with the district court that this case is like those involving a mere difference of opinion among physicians on how an inmate should be treated, which can defeat a claim of deliberate indifference. See, e.g., Norfleet v. Webster, 439 F.3d 392, 396 (7th Cir.2006); Garvin v. Armstrong, 236 F.3d 896, 898 (7th Cir. 2001). Here, Dr. Webster ignored his own conclusions in 2003, which no other expert, including Dr. Maturi, has questioned. At that time, Dr. Webster knew that three specialists previously advised surgery and one specialist disagreed. As a result, Dr. Webster concluded that with 20/100 vision, Ortiz “may need surgery within the next two years” depending on the results of a further evaluation. But Ortiz never received another measurement of his visual acuity in that time. We acknowledge that Ortiz was not completely ignored during this period, but he received nothing more than eyedrops. Furthermore, the record suggests that the medical providers he saw never measured his visual deterioration or corneal distortion. These are the two factors that Dr. Maturi tells us are critical to assessing the need for surgery to treat pterygia. Had the evaluations of those factors that took place in 2006 (which confirmed 20/100 eyesight and corneal distortion) occurred earlier, when Dr. Webster himself thought necessary, these factors would have again corroborated that Ortiz met the criteria for surgery.
The problem with Dr. Webster’s inaction, then, is not that he chose the wrong side in a medical debate. He ignored his own opinion, undisputed in this record, that within two years of 2003 Ortiz required either further evaluation of his vision acuity or surgery. Physicians cannot escape liability simply by “refusing to verify underlying facts” regarding the potential need for treatment. Farmer, 511 U.S. at 843 n. 8, 114 S.Ct. 1970; see Leavitt v. Corr. Med. Servs., Inc., 645 F.3d 484, 498-501 (1st Cir.2011). Because the evidence would permit a jury to conclude that Dr. Webster’s inaction substantially and unreasonably delayed necessary treatment, Ortiz has done enough to survive summary judgment on his claim of deliberate indifference. Berry v. Peterman, 604 F.3d 435, 441 (7th Cir.2010); Gayton v. McCoy, 593 F.3d 610, 625 (7th Cir.2010); Grieveson v. Anderson, 538 F.3d 763, 779 (7th Cir.2008); Jones v. Simek, 193 F.3d 485, 490-91 (7th Cir.1999).
Even if we ignored that Dr. Maturi’s reasoning actually confirms that Ortiz needed surgery in 2003 and considered only that doctor’s “bottom line” that surgery was never necessary (which is not how a court should treat an expert’s opinion, see Mid-State Fertilizer Co. v. Exch. Nat’l Bank, 877 F.2d 1333, 1339 (7th Cir. 1989)), Dr. Maturi’s affidavit merely highlights what we found in genuine dispute in our prior decision. Setting aside Dr. Webster, the record construed in Ortiz’s favor now contains six specialists who recommended surgery and two who concluded that it was unnecessary. Both the dispute about the need for surgery and Dr. Webster’s own failure to resolve the issue through the further evaluation that he himself considered necessary were evident in the record before we remanded the *736case. The addition of a non-treating doctor claiming surgery was unnecessary does not eliminate the dispute. See Abdullahi v. City of Madison, 423 F.3d 763, 772 (7th Cir.2005) (explaining that “the sheer number of witnesses mustered by each side is not a relevant consideration” for deciding motions for summary judgment). Because we previously identified a fact dispute over whether the extended delay in Ortiz’s treatment amounted to deliberate indifference and because Dr. Maturi’s opinion fails to resolve that dispute, we remand for trial.
There is, however, one last issue that warrants our attention. Throughout this litigation Ortiz has asserted a broader contention that the “NO TOWN TRIP” notation suggested a policy of refusing to treat all death-row inmates off-site. Both the notation’s author and Dr. Webster have now provided an innocuous explanation, and Ortiz failed to present any evidence to undermine it. Dr. Webster even attested that there were death-row inmates who did leave the prison for medical treatment during the time in question, thus further refuting Ortiz’s contention that no one in the unit was allowed to do so. Because Dr. Webster offered both an explanation for the notation and examples that undermined the contention, Ortiz may use the “NO TOWN TRIP” notation, at most, to support his claim of deliberate indifference. He may not proceed with a separate contention that the prison denied death-row inmates off-site treatment.
Accordingly, we Vacate the opinion of the district court and Remand with instructions that the case proceed to trial.