Fig 1.
Representative corneal topographic maps and tomographic images of a patient with keratoconus.
The maps and images were before and after using a rigid gas-permeable contact (RGP) lens. (A) Corneal topographic map before using the RGP lens. (B) Tomographic image of the cornea with anterior segment optical coherence tomography before using the RGP lens. (C) Corneal topographic map after using the RGP lens. The keratometric values appear to have decreased after RGP lens use compared with those before RGP lens use. (D) Tomographic image of the cornea with anterior segment optical coherence tomography after using the RGP lens. Corneal protrusion appears to have decreased after RGP lens use compared with that before RGP lens use.
Table 1.
Changes in keratoconus progression indices before and after the use of a rigid gas-permeable contact lens.
Table 2.
Changes in keratoconus progression indices of the anterior and posterior corneal surface before and after the use of a rigid gas-permeable contact lens.
Table 3.
Changes in corneal anterior and posterior surface indices evaluated with Fourier harmonic analysis before and after the use of a rigid gas-permeable contact lens.
Fig 2.
Changes in average keratometric values in patients with keratoconus using a RGP lens.
(A) Comparison of keratometric changes during RGP lens use in eyes with severe and moderate KC based on the Amsler–Krumeich classification. The average keratometric value appears to have decreased in the severe KC group compared with that in the moderate KC group (p < 0.05, unpaired t-test). (B) Comparison of keratometric changes during RGP lens use in eyes with severe and moderate KC based on the Collaborative Longitudinal Evaluation of Keratoconus study group’s criteria. The average keratometric value appears to have significantly decreased in the severe KC group compared with that in the moderate KC group (p < 0.05, unpaired t-test). RGP, rigid gas-permeable contact, KC, keratoconus.
Table 4.
Changes in keratoconus progression indices of severe and moderate keratoconus based on the Amsler–Krumeich classification before and after the use of a rigid gas-permeable contact lens.
Table 5.
Changes in keratoconus progression indices of severe and moderate keratoconus based on the Collaborative Longitudinal Evaluation of Keratoconus study group’s criteria before and after the use of a rigid gas-permeable contact lens.