https://us.alconscience.com/sites/g/files/rbvwei1736/files/pdf//Importance-of-Rotational-Stability-and-Tear-Film-Stability-in-Toric-Contact-Lens-Wearers-Updated.pdf
https://us.alconscience.com/sites/g/files/rbvwei1736/files/pdf//Importance-of-Rotational-Stability-and-Tear-Film-Stability-in-Toric-Contact-Lens-Wearers-Updated.pdf
