Night Vision Abnormalities
Most people complain of blurred vision which is equal during the day as well as night. However, some patients selectively complain of night vision difficulties which may occur in certain retinal disorders like Retinitis pigmentosa, Rod dystrophy etc.
However a new group of disorders hitherto unclassified is now emerging which is labelled as "Higher Order Abberations". Here the quality of vision in terms of contrast sensitivity, glare, coloured haloes is affected and the visual performance can be severely affected especially for patients during activities done under low levels of brightness..For Ex- Night Driving of Cars, Trains, Planes etc..Working on any Equipment with LED light sources may become irritating. Recognizing SIgnBoards, Road Dividers etc as well as estimation of humps, bumps become difficult. Some examples are illustrated below in higher degrees of severity.
Previously these disorders were not treatable as they could not be accurately estimated or quantified. Currently, Advanced equipments called as Abberometers provide reliable data which can be utlized in the treatment of many of these conditions. Customized Lasik treatments utilize these parameters to optimize the Higher order abberations within "natural" levels so that they are not visually debilitating.
