Topography-Guided LASIK: Contoura Vision and Corneal Mapping

Contoura Vision FDA Approval

Contoura Vision is the trade name for topography-guided LASIK using the Alcon WaveLight Allegretto laser platform combined with the VARIO corneal topography system. The FDA approved Contoura Vision in 2015 for the treatment of myopia with or without astigmatism. It was the first topography-guided LASIK system to receive FDA approval in the United States, and FDA trial data showed remarkable outcomes: 30% of patients achieved 20/16 or better vision, surpassing the results typically seen with wavefront-guided or conventional LASIK.

The CATT (Contoura vs Traditional Treatment) and ORCA (Outcomes of Refractive Corneal Ablation) studies provided strong clinical evidence that topography-guided treatment reduces higher-order aberrations on the corneal surface more effectively than standard treatment, and in some studies, more effectively than wavefront-guided LASIK for patients with corneal irregularities.

How Corneal Topography Mapping Works

Corneal topography measures the curvature of the corneal surface using a Placido disk (concentric rings reflected from the cornea) or a scanning-slit system. Modern topographers capture 22,000 or more data points across the corneal surface, creating a highly detailed elevation and curvature map. This map reveals subtle irregularities in corneal shape that cannot be detected by standard refraction and that contribute to reduced contrast sensitivity, glare, and night-vision disturbances.

In topography-guided LASIK, this corneal map is transferred directly to the excimer laser treatment planning software. The laser removes variable amounts of tissue across the corneal surface — smoothing irregular zones and reducing surface aberrations — while simultaneously correcting the refractive error. The result is a more uniform corneal surface that focuses light more precisely on the retina.

Topography-Guided vs Wavefront-Guided LASIK

Feature	Topography-Guided	Wavefront-Guided
What it measures	Corneal surface only	Entire optical system
Data points captured	22,000+ corneal points	~1,200 aberration points
Best for	Corneal irregularities	Internal optical aberrations
Treats irregular astigmatism	Yes	Partially
FDA approval in US	Yes (Contoura, 2015)	Yes (multiple systems)
Supernormal vision potential	High (30% achieve 20/16+)	Moderate (up to 40% in some studies)

Why Topography-Guided LASIK Excels for Irregular Corneas

Many patients have subtle corneal irregularities that cause optical distortions beyond their basic prescription. These include mild forme fruste keratoconus (very early, sub-clinical keratoconus that does not disqualify from LASIK), prior corneal trauma or infection that altered surface shape, or simply natural corneal asymmetry. Standard LASIK applies a uniform treatment profile based on the prescription, leaving these irregularities intact and sometimes worsening them. Topography-guided treatment specifically targets and smooths these irregular zones while correcting the prescription simultaneously.

Important: topography-guided LASIK is not appropriate for patients with frank keratoconus — see LASIK disqualifying conditions. It is for patients with subtle irregularities who are otherwise good LASIK candidates.

Clinical Outcomes vs Standard LASIK

FDA trial data for Contoura Vision showed that 30% of patients achieved 20/16 or better vision — better than the best-corrected visual acuity many of these patients had with glasses before surgery. This "supernormal" vision outcome is rare with standard LASIK. Additional outcome highlights from the FDA trials and post-approval studies include:

• 98.4% of patients achieved 20/20 or better uncorrected distance vision
• Significant reductions in higher-order corneal aberrations compared to baseline
• Better night vision and contrast sensitivity than conventional LASIK in comparative studies
• Patient satisfaction rates exceeding 98% at 12 months

Who Benefits Most from Topography-Guided LASIK

Topography-guided LASIK delivers the greatest benefit to patients with measurable corneal irregularities — subtle surface asymmetries that are visible on topography maps but don't disqualify them from LASIK. It is also valuable for patients with high expectations for quality of vision beyond 20/20, those who experience significant glare or halos with glasses or contacts (suggesting pre-existing HOAs), and patients seeking LASIK enhancement after previous refractive surgery that introduced corneal irregularities. Discuss with your surgeon whether your topography scan shows irregularities that would make this approach worthwhile. See LASIK candidacy and custom LASIK options for context.

Cost Considerations

Topography-guided LASIK is typically priced at $3,000 to $4,500 per eye — at the higher end of the LASIK price spectrum — reflecting both the sophisticated diagnostic equipment and the treatment planning time required. Not all LASIK centers offer Contoura Vision or other topography-guided platforms, so availability may require seeking a specialist center. Compare all procedure costs in our LASIK cost by procedure type guide.