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Measurement of Lens Rotation Soft toric lenses will usually have markings on the lens at a specific reference point so the degree of rotation can be assessed when the lens is on the eye. The markings may be in the form of laser trace, scribe lines (Fig. 9.5), engraved dots or ink dots (Fig. 9.6).

Guide Mark System Each Bausch + Lomb PureVision®2 For Astigmatism (balafilcon A) Visibility Tinted Contact Lens is marked with 1 Guide Mark, in the lens perimeter at 6 o'clock.

Due to the importance of correct orientation in the eyes, toric contact lenses have markings on them. These markings are hard to see with the naked eye. They're actually there to help the optometrist with the fitting, but you can also use them when putting in contacts (if you can see them).

Guide Mark System Each Bausch + Lomb PureVision®2 For Astigmatism (balafilcon A) Visibility Tinted Contact Lens is marked with 1 Guide Mark, in the lens perimeter at 6 o'clock.

Locate the Orientation Marks To help determine the proper orientation of the toric lens, you'll find two primary marks about 1 mm from the lens edge representing the vertical position on opposite ends of the lens at 6 and 12 o'clock (Fig. 1).

0:01 0:48 Simple Steps to help you wear your Bausch and Lomb contact lenses YouTube Start of suggested clip End of suggested clip Open your eyes using the other hand pull your upper lid look at the lens and place it gently on yourMoreOpen your eyes using the other hand pull your upper lid look at the lens and place it gently on your eye and blink a few times. Now repeat the procedure for the other eye. See it's that simple.

Guide Mark System Each Bausch & Lomb PureVision® Toric (balafilcon A) Visibility Tinted Contact Lens is marked with 3 Guide Marks in the lens perimeter, 30 degrees apart at 5, 6, and 7 o'clock. These Guide Marks give an instant reference for estimating lens rotation and orientation.