The Weber contrast of the dark optotypes presented on a light background was 0.95 for the internally illuminated iPad (measured with no sources of glare), 0.85 for the externally illuminated printed ETDRS chart and 0.98 for the internally illuminated Medmont system.
The consequences of glare on measures of driving performance specifically are not well described, partially due to safety issues in attempting to evaluate glare effects during on-road driving.
Second, when sources of glare are minimised, the iPad device can provide measures of distance visual acuity that are indistinguishable from measures made using gold standard letter charts.
When sources of glare are removed the iPad can provide measurements of distance visual acuity that are indistinguishable from measures using a standard letter chart.
The amount of veiling luminance depends on the illumination of glare source, the age of the observer, and angle of the glare source [1, 15] as shown in Eq. (4): {L}_v=frac{ktimes {E}_{glare}}{theta^n} (4).
However, other measures were not significantly correlated with improvements in visual function, namely pre-YAG testing of glare with BAT and pre-YAG grading of fibrosis seen at slit lamp.
Yet, the results confirm that there is a statistically significant correlation between both vertical eye illuminance and horizontal illuminance at the desk and the occupants' perception of glare in a perimeter zone office environment, which is promising evidence towards utilizing such simple measures for indication of discomfort glare in early building design.
Usually two kinds of glare are differentiated: a) Discomfort glare (also called psychological) b) Disability glare (or physiological). .
This type of glare should be classified as absolute factor glare which is different from relative factor glare in terms of glare analysis.
This approach can increase the accuracy of glare evaluation and simplify glare evaluation procedures.
