Timeline for Contact lenses in medieval time
Current License: CC BY-SA 3.0
2 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Aug 27, 2016 at 6:27 | comment | added | Random832 | "And if you don't have a literate population, then you'll have to find an alternative to reading letters off the test chart." A Landolt C chart, or an E chart (the former is the letter C in eight orientations, the latter consists of the letter E in four orientations) doesn't require literacy, just knowing left from right. | |
| Aug 25, 2016 at 22:30 | history | answered | JerryTheC | CC BY-SA 3.0 |