Ocular prosthesis (artificial eye) with light blue iris, referred to as stock or pre-made eyes of the 'reform' design as originally developed by Herman Snellen, probably made in England, c.1890-1910 Ocular prosthesis (artificial eye) referred to as stock or pre-made eyes of the 'reform' design
Revolving drum for eye-testing, Snellin-type chart with four faces each which has a different test type Revolving eye-testing chart
Ocular prosthesis (artificial eye), with blue iris, referred to as stock or pre-made eyes of the 'reform' design as originally developed by Herman Snellen, probably made in England, c.1890-1910 Ocular prosthesis (artificial eye) referred to as stock or pre-made eyes of the 'reform' design
Ocular prosthesis (artificial eye), with dark brown iris, referred to as stock or pre-made eyes of the 'reform' design as originally developed by Herman Snellen, probably made in England, c.1890-1910 Ocular prosthesis (artificial eye) referred to as stock or pre-made eyes of the 'reform' design