Assertion: astigmatism's meridian | /r/AtLocation | this condition
Facets:
value: always
type: TEMPORAL
value: 90˚ apart from each other
type: OTHER
Source sentences:
text: In this condition, the principal meridians are always 90˚ apart from each other and in this case, there will be a consecutive variation in the refractive power from one meridian to another.