Page 130 - The Indian Optician Digital Edition May-June 2023
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TABLE 2 - IPAD BASED STEREOACUITY
OU
PRE 72.68 ± 60.97
POST 69.50 ± 31.94
P-VALUE 0.462
wearing MFCL and 1.99 ± 1.00 after wearing
MFCL, respectively. Although the p-value was
not statistically significant (p = 0.24), the data
showed clinically significant improvement,
which correlated with the present study's high
eye dominance test is performed. The patient's satisfaction level and improved contrast.
eyes are covered with +1.50 D and +2.00 D lenses, It is important to note that tasks such as
and the subject must decide which position using tools, threading needles, or operating
results in the least blur with both eyes open. computers all require good stereopsis and
This can assist in determining whether greater precise hand-eye coordination. The study found
plus or higher add powers should be used in that wearing MFCL led to an improvement in
the non-dominant eye to enhance near vision stereopsis. The mean ± standard deviation for
without impairing distance vision. stereo acuity was 72.68 ± 60.91 before wearing
Once the appropriate lenses are selected, a MFCL and 69.50±31.94 after wearing MFCL.
multifocal soft contact lens trial is given to the Table 2 shows that there was no statistically
patient. After an adaptation period, the lens fit significant difference between pre- and post-
is evaluated, and the care and maintenance of stereopsis (P=0.462).
the lenses, as well as insertion and removal, are The study found that multifocal soft contact
explained to the patient. On the follow-up visit lenses provided significantly better stereo acuity
after one week, distance and near visual acuity, compared to spectacles and other correction
iPad-based contrast sensitivity, and iPad-based modalities. Furthermore, the results suggest
stereo acuity are measured. that multifocal soft contact lenses offer greater
RESULTS comfort and satisfaction in terms of stereopsis
and contrast sensitivity when compared to
The paired t-test (two-tailed) was used to traditional correction options, including single
statistically analyse the results of the iPad- vision distance, intermediate or near, bifocal,
based contrast sensitivity and stereo acuity progressive spectacles, or soft contact lenses.
tests. The mean contrast sensitivity reading for
the right eye before wearing MFCL was 1.76 ±
0.90, which increased to 1.82 ± 0.91 after wearing
MFCL. Although the p-value was not statistically THERE ARE SEVERAL CONTACT LENS
significant (p = 0.17), the data showed a clinically OPTIONS AVAILABLE FOR CORRECTING
meaningful improvement in comparative PRESBYOPIA, INCLUDING SINGLE-VISION
contrast sensitivity. For the left eye, the mean DISTANCE CONTACT LENS CORRECTION
reading of contrast sensitivity was 1.8 ± 0.91 WITH READING SPECTACLES,
and 1.85 ± 0.91 before and after wearing MFCL, MONOVISION CORRECTION,
respectively.
OR BIFOCAL AND MULTIFOCAL
Comparative contrast sensitivity showed CORRECTION BASED ON ALTERNATING
a statistically significant improvement with a OR SIMULTANEOUS IMAGE PRINCIPLES
p-value of 0.02. For both eyes, the mean reading
of contrast sensitivity was 1.91 ± 0.95 before
126 | THE INDIAN OPTICIAN | MAY-JUNE 2023 OPTOMETRY
