Clinical Measures of Visual Performance
There is a plethora of vision tests available, including both tests designed for general clinical use and those specific to low vision. Even within the ‘low vision’ category the tests…
Transverse Magnification
Electronic Vision Enhancement Systems Optical magnifying systems are limited practically to a maximum magnification of about 20×. If using a plus-lens, this would require a +80.00DS lens with a working…
Relative Size Magnification: Increasing the Object Size
Large Print Increasing the size of the object is most commonly put into practice in the form of ‘large print’, when it may be used alone, or in addition to…
Magnification
Possible Approaches If the low-vision patient cannot resolve the retinal image, despite the fact that it is optimally focussed onto the retina by their refractive correction, then it is necessary…
Patient-Centred Outcome Measures
Patient-Centred Outcome Measures These are also known as ‘patient-reported outcome measures’ and ‘patient relevant outcome measures’. Patients are not only interested in improvements in clinical data (e.g. visual acuity), but…
Prevalence and Causes of Low Vision
The World-Wide Situation The prevalence of visual impairment (VI) is the percentage of the general population who have the condition at a given point in time. Usually, the prevalence of…
What Is Low Vision?
Low vision, partial sight and visual impairment are synonyms for the same state: reduced vision, with both eyes open, even with the best optical correction. The definition does not include…
Optic Neuropathies: Ischemic, Inflammatory, Infectious, or Compressive
Optic Neuropathies: Ischemic, Inflammatory, Infectious, or Compressive Mitchell B. Strominger Victoria M. Hammond THE CLINICAL CHALLENGE Optic neuropathy is the general term that describes vision loss secondary to a disease…
