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Masayuki Horiguchi, Hiromitsu Suzuki, Yoshihisa Kojima, Yoshiaki Shimada; New Visual Acuity Chart for Patients with Macular Hole. Invest. Ophthalmol. Vis. Sci. 2001;42(12):2765-2768.
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purpose. To evaluate the usefulness of a new multiple-letter visual acuity chart
(MLAC) for the measurement of visual acuity in patients with macular
methods. Visual acuity was measured using a standard visual acuity chart
(Landolt rings, also referred to as C’s) and with the MLAC in normal
subjects and in patients with a cataract or a macular hole. The MLAC
has 14 plates (45 × 45 cm), and on one plate, many Landolt C’s
were printed with the gaps pointing in the same direction and all of
one size. The sizes of the letters and gaps were made to give
equivalent visual acuities of 0.1, 0.15, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7,
0.8, 0.9, 1.0, 1.2, 1.5, and 2.0. The spacing between the letters was
33.3% of the diameter of the C’s. Each chart projected many C’s onto
the macular area (5° × 5°), which permitted the measurement of
visual acuity at an extrafoveal point without the patient having to
search for the extrafoveal point with the best acuity.
results. There was no difference in the acuity measurement determined with the
standard chart and the MLAC in normal subjects and patients with
cataracts. Twelve of 16 patients with open macular hole, however,
demonstrated higher acuity measurement (more than two lines) on the
MLAC than on the standard chart. The improvement of visual acuity
measurement after successful macular hole surgery was significantly
less with the MLAC than with the standard chart.
conclusions. Our results suggest that the standard acuity chart, when administered
before surgery, underestimates the patient’s potential visual acuity
after surgery, whereas the MLAC provides a better estimate of the
patient’s postoperative acuity. The MLAC can be a useful tool for
measuring visual acuity in patients with macular
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