{"id":482,"count":1,"description":"The wearer\u2019s near vision behaviour\u00a0 (NVB) ratio, describes how the wearer adjusts his or her gaze vertically during near tasks.\r\n\r\nThat ratio is close to 0 for wearers who have a strong tendency to lower their eyes whenever they move to the next line, and therefore change their head and body posture or the tablet position only slightly; the ratio is close to 1 when wearers maintain a static gaze position, i.e., they have a strong tendency to change their posture and\/or their position of their digital device or reading material.\r\n\r\nThanks to large wearer studies each wearer\u2019s behaviour is reproducible and represents an appropriate data point for customization, since it is both specific to each individual and differentiating.\r\n\r\nNear Vision\u00a0 Behaviour\u00a0 (NVB) personalisation aims to ensure lenses are designed and tailored as closely as possible to the wearer\u2019s specific posture and behavior during near vision work.\r\n\r\nVertical and horizontal variations in power can be controlled to\u00a0 maximize field depth and expand the field of vision, minimising aberrations and maximising visual acuity.","link":"https:\/\/peterdarcy.com.au\/tag\/near-vision-behaviour\/","name":"Near Vision Behaviour","slug":"near-vision-behaviour","taxonomy":"post_tag","meta":[],"yoast_head":"\n