The Effect of the Free-toroidal Design Lenses on the Subjective Visual Quality in the Myopic Population

A prospective, self-control, double-blind design was conducted in Tianjin. Two hundred participants were assigned to wear two kinds of spectacle glasses. To examine the effect of free-toroidal design and aspherical lens on the subjective visual quality among the myopic population.

Inclusion Criteria:health volunteerstheir spherical refraction from -0.50 to -8.00 Diopter, with the cylinder diopter less than -3.00 Diopterbest corrected visual acuity (BCVA)≥ 20/20 in both eyesstable refraction (no change greater than 0.5 Diopter within two years)Exclusion Criteria:if they had Aphakic or intraocular lens eyes, had a history of trauma, active eye disease or ocular surgery, serious systemic diseases, or had a wearing history of corneal contact lenses.