Orthokeratology or Ortho-K, is a treatment process, that uses rigid contact lenses to gradually reshape the cornea, to improve the vision of those suffering from Myopia.

The John McAllister firm was the First U.S. Shop for Optometric Services manufacturing a variety of spectacle frames, that were versatile in nature and that allowed an individual the ability to easily change the lenses within their frames.

Anisometropia is a condition first discovered by a Spanish scholar named Benito Daza de Valdes. According to Contact Lens King, he described the disorder as a disorder where the two eyes have different refractive powers.

King Charles I granted a royal charter in 1629 to the Worshipful Company of Spectacle Makers in London providing the company the ability to set regulations and standards for optical devices.

Benito Daza de Valdes documented corrective vision in his books in 1623, considered the first book of optometry. In these books he addresses the properties of the eye and vision defects, corrective optical tools and dialogs between craftsmen and doctors.

Willebrord Snell was in fact the first person to document the relationship between the paths taken by light rays when crossing boundaries between two surfaces and their refractive index.