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For decades, manufacturers have attempted to reduce or eliminate the opticalaberrations that appear on the progressive addition lens' surfaces duringmanufacturing. Besides every effort made, some of these distortions areinevitable given how lenses are fabricated, where in fact, astigmatism appearson the surface and cannot be entirely removed or where non-uniformmagnification becomes inherent to the power change across the lens. Somepresbyopes may refer to certain discomfort when wearing these lenses for thefirst time, and a subset of them might never adapt. Developing, prototyping,testing and purveying those lenses into the market come at a cost, which isusually reflected in the retail price. This study aims to test the feasibilityof virtual reality for testing customers' satisfaction with these lenses, evenbefore getting them onto production. VR offers a controlled environment wheredifferent parameters affecting progressive lens comforts, such as distortions,image displacement or optical blurring, can be analysed separately. In thisstudy, the focus was set on the distortions and image displacement, not takingblur into account. Behavioural changes (head and eye movements) were recordedusing the built-in eye tracker. Participants were significantly more displeasedin the presence of highly distorted lens simulations. In addition, a gradientboosting regressor was fitted to the data, so predictors of discomfort could beunveiled, and ratings could be predicted without performing additionalmeasurements.

Virtual reality (VR) as a testing bench for consumer optical solutions:  A machine learning approach (GBR) to visual comfort under simulated  progressive addition lenses (PALS) distortions