Conventional manifest refraction is performed in well illuminated rooms, leading to prescription values that work well in daylight situations. However, as the pupil enlarges in low light situations, the peripheral aberrations of the eye can lead to refractive shifts that make the conventional prescription no longer valid. i.Scription technology is able to combine the information about peripheral aberrations provided by i.Profilerplus together with manifest refraction, resulting in an optimized prescription to provide better day and night vision.