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Optical coherence tomography provides insight into the effect of intacs in keratoconus.

K eratoconus is a bilateral, asymmetric, chronic, initially progressive ectasia of the cornea characterized by steepening, distortion, and thinning of the apical cornea as well as corneal scarring. Intrastromal corneal ring segments (Intacs; Addition Technology Inc, Sunnyvale, California) is 1 treatment option available for patients with keratoconus, especially those with contact lens intolerance. Intacs placement in patients with mild to moderate keratoconus generally improves best spectacle-corrected visual acuity (BSCVA) and uncorrected visual acuity and reduces astigmatism. Intacs have generally been found to be safe and effective. However, the exact effect Intacs have on the keratoconic cornea is still debatable. Here we imaged the corneal changes induced by Intacs using comparative image analysis of optical coherence tomography (OCT).