Some useful stuff

Dear LVTF,
Attached is the URL of a table that lists all the visual acuities in the
various scales.
http://nosetothepage.org/AcuityScales.html
Foot, Metre, Decimal and logMAR. It should make reading research articles
easier.

A recent study shows that most people with low vision like to enlarge their
text a lot. They also prefer making their text large. Of legally blind,
20/200 that enlargement is achieved as follows: they shorten the viewing
distance by a factor of 2.8. That is they view at 1/2.8 the normal
distance. Also they enlarge the text by a factor of 6. Taking this together
that means that people at 20/200 on the average prefer magnification of
2.8x6=16.8.

Also, as we observe people with low vision like reading on desktop monitors.

I have also included

Here is the article abstract:
How People with Low Vision Achieve Magnification in Digital Reading.
Granquist C, Wu YH1, Gage R1, Crossland MD2, Legge GE1.

Abstract
SIGNIFICANCE:
Digital reading displays provide opportunities for enhancing accessibility
of text for low vision. How are these displays used by people in their
daily lives?

PURPOSE:
Subjects responded to an online survey concerning their vision history,
reading technology, display preferences, and reading habits. Here, we
report on findings concerning acuity and magnification.

METHODS:
The survey asked subjects to arrange a text passage for typical reading and
to report viewing distance, screen dimensions, and the number of characters
per line. Seventy-five adult subjects (most with early-onset low vision,
few with central field loss) completed all survey questions relevant to the
analysis of acuity and magnification. Mean acuity was .92 logMAR (range,
0.1 to 1.6), and mean age was 44.8 years (range, 18 to 71 years). Twelve
normally sighted controls reported the same information while viewing the
passage on cell phones, tablets, and computers.

RESULTS:
The controls had a mean viewing distance of 38.7 cm and a mean x-height of
1.38 mm. For all three types of devices, angular x-height was 0.21° (close
to laboratory estimates of the critical print size for reading). Low vision
subjects showed decreasing viewing distance and increasing print size with
larger values of logMAR acuity. Most of the low vision subjects achieved
their desirable magnification by a combination of reduced viewing distance
and increased physical letter size. The majority (54 of 75) relied more on
letter-size magnification. Relative to the controls, regression analysis
revealed that a typical low vision subject with logMAR acuity of 1.0
reduced viewing distance by a factor of 2.8 and enlarged physical print
size by a factor of 6.

CONCLUSIONS:
Our survey shows that people with a wide range of acuities are engaged in
digital reading. Our subjects achieved desirable magnification primarily by
enlarging physical character size and to a lesser extent by reducing
viewing distance.