Eyes - An Insight Into Visual Acuity

Visual acuity (VA) commonly refers to the clarity of vision, but technically rates an examinee's ability to recognize small details with precision. Visual acuity is measured by your ability to identify letters or numbers on a standardized  eye chart  from a specific viewing distance. ·      Three major physical and neurological factors determine visual acuity      o     the sharpness of the retinal image within the eye      o     the health and functioning of the retina      o     the sensitivity of the interpretative faculty of the brain. ·        Neural factors that limit acuity are located in the retina or the brain (or the pathway leading there). For example: o     detached retina o     macular degeneration o     amblyopia   (caused by the visual brain not having developed properly in e...

From our research, there are several factors and causes that may influence the visual acuity outcome which are ages, ethnicity, the number of injections, types of regimen injected and gender.  Initiating injection at older ages was also associated with a marked risk toward poor visual outcome. According to our finding, increase in age number resulting in decreasing of visual acuity letter scored. This is due to a decrease in pupil size. The lens is composed of transparent and flexible tissue and is located directly behind the iris and the pupil. It is responsible for the change of focal distance of the eyes, allowing it to focus on objects at various distances by changing its shape, becomes heavier and thicker and loses its elasticity due to the anatomical changes, which is ageing.  Increasing of injection , numbers will have resulted in the probability of achieving a negative outcome. This is because it will cause the patients to have a higher risk of developing Ischemic Opt...