TransPRK Laser Eye Surgery: What It Is and What to Expect

What is TransPRK?

TransPRK stands for transepithelial photorefractive keratectomy. It belongs to the family called surface ablation, in which the cornea is reshaped from the outside rather than through a flap or a lenticule, and it is the surface technique in which the laser does both jobs: removing the epithelium and reshaping what lies beneath it.

The name is often written out as the trans prk procedure, and it describes a technique rather than a brand or a particular device. It is offered on excimer platforms that have a transepithelial treatment mode, so whether a clinic can offer it depends on the equipment installed there rather than on preference alone.

One clarification is worth making early, because the phrase trans prk lasik surgery is common online and misleading. TransPRK is not LASIK. LASIK lifts a hinged flap and reshapes the tissue beneath it, whereas no surface procedure creates a flap at all. The two are grouped together only because both use a laser to change the shape of the cornea.

The TransPRK procedure: step by step

The sequence is short and the patient is awake throughout. Numbing drops are used, so the treatment itself is not painful; the eye is held open with a speculum and the other eye is covered for the duration.

• Anaesthetic drops are placed and the eye is positioned under the excimer laser.
• The outer layer of the cornea is removed by the laser itself, as the first part of the same treatment pass, rather than by alcohol, a blade or a brush.
• The excimer laser reshapes the surface to the prescription measured at the assessment, whether that is short sightedness, long sightedness, astigmatism or a combination.
• A bandage contact lens is normally placed to protect the healing surface while it closes, and the drop schedule begins the same day.
• The second eye is usually treated in the same session or at a separate visit, depending on the surgeon and on how the first eye behaves.

TransPRK vs standard PRK: what is the difference

Both are surface treatments, so both leave the cornea without a flap and both require the outer layer to grow back. The difference is confined to the first step. Conventional PRK removes the epithelium separately, with a blade, a rotating brush or a diluted alcohol solution, and then applies the excimer laser to the exposed tissue. TransPRK performs both in one continuous pass, so the layer is removed by the same laser that reshapes the cornea.

The less obvious difference is planning. Because the transepithelial treatment both clears the surface layer and corrects the prescription in one pass, the two are calculated together against a map of the corneal surface rather than treated as separate acts. Whether that produces a different clinical outcome is a question clinicians still answer differently: the published comparison between these techniques comes from single studies rather than pooled analyses, and a preference is often about the platform a clinic has installed and how the surgeon was trained.

What matters more to most readers lies beyond the difference between the two surface techniques. The trade-off a patient is really choosing between is surface against flap against lenticule, and the dimension-by-dimension comparison of TransPRK with PRK is set out on its own page, linked below.

Recovery time and what to expect

The first days are the demanding part. Until the surface closes over, vision is blurred and the eye is commonly sore, gritty, watering and sensitive to light. This is the period in which surface treatment differs most obviously from a flap or lenticule procedure, where the surface is left intact and the eye settles sooner.

Haze is a recognised finding after surface treatment, more likely with higher prescriptions and deeper treatment, and the drop schedule is planned around that risk. A residual prescription is also possible, as it is after any refractive procedure, and the options afterwards differ from those after a flap procedure because there is no flap to lift.

• The bandage contact lens is usually removed at the first follow-up visit, once the surface has closed.
• Vision improves as the surface heals and then keeps settling for weeks to months. It is normal for the two eyes to recover at different rates, and for vision to fluctuate while they do.
• Drops are part of the routine rather than an optional extra, including a steroid course intended to reduce the risk of haze.
• Sun protection matters more than usual during healing, and the eye is not rubbed.
• Water and swimming are restricted until the surgeon says otherwise, and the restriction runs longer than after a flap or lenticule procedure.
• Contact sport, eye makeup and screen use resume on the instructions your surgeon gives, which override any general guidance.