It is an instant photograph of the mirror reflection on the cornea of a Placido ring. It is useful to determine the Apex of the cornea, the visual axis, the line of sight, the orientation of the astigmatism and the possible irregularities of the corneal surface. It can be requested in the preoperative and postoperative period of Refractive Surgery, Corneal Transplants and any other corneal pathology.

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