Updated: Feb 4, 2020
Lens Movement Normal: A well fit VFL3 lens will move approximately 1-2mm with the blink and will not cause distance visual disturbance. Lens movement should be considered along with lens position and dye pattern.
Minimal: A steep/tight fitting VFL3 will nor move well with the blink. It could position
centrally or decenter to any position based on topography. Verify with dye pattern evaluation. Flatten base curve to increase movement.
Excess: A flat/loose fitting base curve will move more than 1-2mm and cause fluctuating vision as the lens displaces with the blink. Verify with dye pattern evaluation.Steepen base curve to decrease movement.
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