Local medical experts have developed nano-based new materials to deliver drugs deep into corneal tissues to help patients with keratoconus.Keratoconus is a progressive, non-inflammatory condition in which there is central thinning of the cornea, changing it from dome-shaped to cone-shaped.It usually has its onset during puberty, with an incidence of one in every 2,000 but is rising in recent years. About 10 to 20 percent of the patients need a corneal transplantation eventually, imposing a serious burden on patients and the society.