-
chart used to
measure visual acuity comprising lines of
optotypes in
ranges of sizes.
Optotypes are the
letters or
symbols shown on an eye chart. Eye charts...
- an
acuity chart are
formally known as "
optotypes". In the case of the
traditional Snellen chart, the
optotypes have the
appearance of
block letters, and...
- as a
Landolt ring,
Landolt broken ring, or ****anese
vision test, is an
optotype—a
standardized symbol used for
testing vision. It was
developed by the...
-
acuity would discern the same
optotype. Thus, 6/12
means that a
person with 6/6
vision would discern the same
optotype from 12
metres away (i.e. at twice...
-
LogMAR value of the
baseline read − 0.02 ×
number of
optotypes read
Given that each line has 5
optotypes, the
equivalent formula is:
LogMAR VA =
LogMAR value...
-
which uses
continuous text
paragraphs with
logarithmic progression of
optotype sizes, was a
reading chart introduced in 1960s. Near
acuity was recorded...
- The most
significant innovation was Snellen's use of what he
called optotypes,
specially designed characters generated on a 5x5 grid,
rather than using...
-
resolution of 2
arcminutes per line pair,
equivalent to a 1
arcminute gap in an
optotype,
corresponds to 20/20 (normal vision) in humans. However, in the compound...
- a lit
background to give the
reader the best
chance of
detecting the
optotypes (letters or non-letter symbols).
Distance visual acuity and near visual...
- The
Jaeger chart is an eye
chart used in
testing near
visual acuity. It is a card on
which paragraphs of text are printed, with the text
sizes increasing...
