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In normally sighted newborns, retinal cone cells are not well-developed at birth, resulting in babies having poor visual acuity and poor color vision.

Volunteers using the lenses also reported noticeable improvements in visual acuity at a variety of distances and lighting conditions.

They formed a dataset from 34 variables that are commonly collected during ophthalmic examinations, such as age, current visual acuity, and the diameter of the cornea.

Sighted participants recruited for the study were asked to test and verify the phosphene maps based on visual acuity and object recognition.

Like the hugely successful early 20th century L.A. landscape painter Granville Redmond, who was also deaf, Castle is sometimes claimed to have compensated for his hearing loss through an increased power in visual acuity.