Do Toric Contact Lenses Have Lines?

Toric lenses generally have engraved lines along their nominal horizontal and/or vertical meridians to indicate how much the lens has rotated on the eye (Figure 2). This enables the practitioner to offset the astigmatic axis so that when the lens is on the eye, the optical correction is accurate.

Why do astigmatism contacts have lines?

What is the reason for the lines on toric contacts? These lines are an orientation marking and the purpose is to identify where the lens is sitting on the eye. For the practitioner, when checking the fit of the lens, the small line on the contact lens should be sitting at the bottom of the eye by the lower lid.

How do you align toric contact lenses?

Some Toric lenses for Astigmatism have a small mark on the lens to help identify the bottom portion easily. Hold the eyelids wide open and look straight ahead as you place the lens over your eyes. Placing the lens correctly is critical; blink your eyes a few times to set the lens correctly in position.