Native astigmatism biases subjective best focus setting, published in the Journal of Vision
The study, published in the current issue of Journal of Vision, explores the role of native astigmatism and ocular aberrations on best-focus setting and its shift upon induction of astigmatism in 42 subjects (emmetropes, myopes, hyperopes, with-the-rule and against-the-rule astigmats), using a custom adaptive optics system. Best focus shifted in opposite directions in WTR and ATR astigmats upon induction of astigmatism, symmetrically with respect to the best-focus shift in nonastigmatic myopes. The shifts are consistent with a bias towards vertical and horizontal retinal blur in WTR and ATR astigmats, respectively, indicating adaptation to native astigmatism. The study is part of a collaboration between VioBio Lab and Essilor International.
Full publication: Marcos, S., Velasco-Ocana, M., Dorronsoro, C., Sawides, L., Hernandez, M., & Marin, G. (2015). Impact of astigmatism and high-order aberrations on subjective best focus. Journal of Vision, 15(11):4, 1–12.