'Keenness of vision can be measured by rotating a circle with a break in it known as the "Landolt" this'
C
WE GET LETTERS: Keenness of vision can be measured by rotating a circle with a break in it known as the Landolt this
Keenness of vision can be measured by rotating a circle with a break in it known as the "Landolt" this
Keenness of vision can be measured by rotating a circle with a break in it known as the "Landolt" this
WE GET LETTERS
C
WE GET LETTERS