In the majority of cases, no. Haze that is identified early and managed with structured treatment resolves over 6-12 months in most patients. The cases that become permanent are uncommon, and most are preventable.
The Natural History
Corneal haze typically emerges in the first 1-3 months after surface ablation. Its natural course depends on severity: mild haze in a well-managed patient tends to regress; moderate to severe haze without treatment tends to progress. The 3-6 month postoperative window is where clinical intervention has the greatest impact. ¹
In practical terms: Haze is not a fixed event. It evolves over months, and treatment initiated early is substantially more effective than treatment initiated after the haze has consolidated.
What Determines Whether Haze Resolves
The likelihood of complete resolution depends on:
- Severity at the time of identification – Fantes grade 1-2 haze is far more likely to resolve than grade 3-4
- Speed of treatment initiation – the earlier the steroid taper begins, the better the outcome
- Degree of correction treated – high myopia above −6.00 D carries both higher haze risk and slower resolution
- Whether prophylactic MMC was used at the original surgery
- Patient compliance with UV protection, lubrication, and follow-up attendance
Medical Treatment
Topical prednisolone acetate 1% is the first-line treatment for established haze. It suppresses the fibrotic keratocyte response and, when tapered gradually over 8-16 weeks, allows the corneal stroma to remodel without progressive scarring. Fluorometholone is used in lower-risk cases with milder presentations. ²
Surgical Treatment for Persistent Haze
Phototherapeutic keratectomy (PTK) is the established surgical treatment for haze that does not respond to medical management. PTK removes the superficial stromal opacity. Concurrent MMC application reduces the risk of recurrence. In carefully selected patients, a refractive element can be combined with PTK to address any residual refractive error at the same time. ³
How Often Is Haze Truly Permanent?
Across contemporary published series using prophylactic MMC, visually significant permanent haze affects fewer than 2% of PRK and TransPRK patients. The risk is highest in patients treated for high myopia without MMC, a protocol that is no longer standard practice in experienced centres. ⁴ ⁵
Blue Fin Vision® specifically: At Blue Fin Vision®, anterior segment OCT is performed at the Month 1 review for all PRK and TransPRK patients, not as an optional extra but as the standard protocol. Haze detected at Fantes grade 1 on OCT at Month 1 is substantially easier to treat than haze detected clinically at Month 3. This is the specific structural difference that early OCT makes.
When things are straightforward, many clinics perform well. When they are not, that is where systems, experience and accountability matter most.
Frequently Asked Questions
If my haze resolves, will my vision be exactly the same as if it had never happened?
In most cases, yes. Complete resolution of haze on OCT is typically accompanied by full recovery of uncorrected and corrected visual acuity. Residual subepithelial opacity at a sub-clinical level may persist on OCT without any functional visual impact.
Can I do anything to reduce my risk of haze developing?
Before surgery: attend your consultation with full corneal topography to allow your surgeon to assess your risk profile. After surgery: strict UV protection, sunglasses outdoors from day one, and attendance at all scheduled review appointments. Compliance with the steroid taper prescribed at your follow-up visits is critical.
If I develop haze, will it affect my eligibility for enhancement?
It may delay it. Enhancement eligibility requires corneal stability confirmed on serial topography. Active haze is a contraindication to enhancement until it has resolved and the corneal surface is stable. This is the clinical reason why haze management precedes any enhancement assessment at Blue Fin Vision®.
References
- Fantes FE, Hanna KD, Waring GO, Pouliquen Y, Thompson KP, Savoldelli M. Wound healing after excimer laser keratomileusis in monkeys. Arch Ophthalmol. 1990;108(5):665-675.
- Nassaralla BR, McLeod SD, Nassaralla JJ Jr. Effect of mitomycin C on corneal haze after photorefractive keratectomy for residual myopia following radial keratotomy. J Refract Surg. 2007;23(3):286-290.
- Rajan MS, O’Brart DP, Patmore A, Marshall J. Cellular effects of mitomycin-C on human corneas after photorefractive keratectomy. J Cataract Refract Surg. 2006;32(10):1741-1747.
- Gambato C, Ghirlando A, Moretto E, Busato F, Midena E. Mitomycin C modulation of corneal wound healing after photorefractive keratectomy in highly myopic eyes. Ophthalmology. 2005;112(2):208-218.
- O’Doherty M, O’Keeffe M, Kelleher C. Five year follow up of photorefractive keratectomy for all levels of myopia. Br J Ophthalmol. 2006;90(1):20-23.
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