33
/es/
AIzaSyAYiBZKx7MnpbEhh9jyipgxe19OcubqV5w
August 1, 2025
5200136
491465
2
Public Timelines
Menu
Public Timelines
FAQ
Public Timelines
FAQ
For education
For educational institutions
For teachers
For students
Cabinet
For educational institutions
For teachers
For students
Open cabinet
Crear
Close
Create a timeline
Public timelines
Library
FAQ
1 ene 1870 año - Optometers developed to measure refractive error by Knapp and Badal 1870
Añadido al timeline:
The development of optometry through the ages
By
Christian Pot
10 abr 2021
0
0
764
fecha:
1 ene 1870 año
Ahora mismo
~ 155 years ago
About & Feedback
Acuerdo
Privacidad
Biblioteca
FAQ
Support 24/7
Cabinet
Get premium
Donate
The service accepts bank transfer (ACH, Wire) or cards (Visa, MasterCard, etc). Processed by Stripe.
Secured with SSL
