TYRO-97 is an ideal high Dk lens material for the management of irregular corneal conditions. The irregular corneal conditions (in non-diseased eyes) including keratoconus, pellucid marginal degeneration, post-penetrating keratoplasty, post-radial keratotomy and post-LASIK surgery very often require a large diameter GP material to help maximize visual acuity while ensuring optimum eye health.