Purpose: The study was intended to determine that difference of accommodative and eye movement response when the subject having sufficient accommodation in wearing multifocal soft contact lenses(SCLs) and single vision soft contact lenses, and to investigate the usefulness of multifocal soft contact...
Purpose: The study was intended to determine that difference of accommodative and eye movement response when the subject having sufficient accommodation in wearing multifocal soft contact lenses(SCLs) and single vision soft contact lenses, and to investigate the usefulness of multifocal soft contact lenses for the 20’s having sufficient accommodation.
Methods: The mean age of the participating 30 subject(female 24, male 6) were evaluated using multifocal SCLs(1-DAY ACUVUE® MOIST MULTIFOCAL, Low Add +0.75 to +1.25 D)and single-vision SCLs(ACUVUE OASYSⓡ)for 2 weeks. Inclusion criteria were as follows: (1)mean spherical equivalent refractive error between –2.36±1.86 D, (2)total astigmatism of at most -0.75 D in each eye, (3)best corrected distance visual acuity (VA) of at least 0.00 logMAR in each eye. The respective pupil diameter(mm) of
photopic(520 lux) and mesopic vision(0.7 Lx) were 5.22±0.69 and 6.07±0.77 in not wearing contact lenses. Objective refraction, best corrected visual acuity at distance and near, contrast sensitivity at distance and near, straylight
value, accommodative response, monocular commodative facility, binocular accommodative facility, near point of accommodation using push-up method and pull-away method, negative and positive fusional vergence at near,
pursuits eye movement, saccadic eye movement, near point of convergence were measured. Subjective satisfaction according to visual acuity and reduce
or increase the feeling of fatigue by wearing multifocal SCLs, a cause of discomfort, preference were investigated by using a questionnaire.
Results: There were no statistically significant differences in corrected visual acuity at distance and near. Low contrast sensitivity at near was decreased after wearing multifocal SCLs though the results were not statistically
significant. In relation to straylight(t=-2.86, p=0.005**), accommodative response at 40 cm(t=-5.92, p=0.000***), monocular accommodative facility(t=-2.31, p=0.024*), binocular accommodative facility(t=-2.58, p=0.012*),
measured values at each test were higher in wearing multifocal SCLs than in wearing single vision SCLs. And measured values of near point of accommodation test were shorter in wearing multifocal SCLs than in wearing
single vision SCLs(t=3.18, p=0.002**). Negative and positive fusional vergence reserve at near were increased in wearing multifocal SCLs than in wearing single vision SCLs though the results were not statistically significant.
According to a survey carried out in this study, in relation to satisfaction of visual acuity wearing multifocal SCLs was better than wearing single vision SCLs at near. However, in general, wearing single vision SCLs were preferred in near and far distance. There were no statistically significant
differences in reduce in the feeling of fatigue between wearing multifocal SCLs and single vision SCLs. The most likely reason of the discomfort caused by wearing multifocal SCLs than wearing single vision sSCLs were blurred distance vision and dryness.
Conclusions: Even though in wearing for 6 hours a day for 2 week, it is considered that still incomplete Inhibition of the image from incident light through the periphery of the multifocal soft contact lenses may be exist.
therefore straylight and accommodative response values were higher after wearing multifocal soft contact lenses than wearing single vision SCLs, but accommodative facility was increased and near point of accommodation is was shorter due to increased the depth-of-focus owing to ‘near reflex’ caused by the increased accommodative response and decreased spherical aberration caused by aspheric design of lens.
The study suggests that after the adaptation period longer than two weeks, wearing multifocal soft contact lenses were expected to bring positive effects in relation to increased accommodative function and reduced accommodative fatigue related near work to young people in their 20’s having sufficient accommodation.
Purpose: The study was intended to determine that difference of accommodative and eye movement response when the subject having sufficient accommodation in wearing multifocal soft contact lenses(SCLs) and single vision soft contact lenses, and to investigate the usefulness of multifocal soft contact lenses for the 20’s having sufficient accommodation.
Methods: The mean age of the participating 30 subject(female 24, male 6) were evaluated using multifocal SCLs(1-DAY ACUVUE® MOIST MULTIFOCAL, Low Add +0.75 to +1.25 D)and single-vision SCLs(ACUVUE OASYSⓡ)for 2 weeks. Inclusion criteria were as follows: (1)mean spherical equivalent refractive error between –2.36±1.86 D, (2)total astigmatism of at most -0.75 D in each eye, (3)best corrected distance visual acuity (VA) of at least 0.00 logMAR in each eye. The respective pupil diameter(mm) of
photopic(520 lux) and mesopic vision(0.7 Lx) were 5.22±0.69 and 6.07±0.77 in not wearing contact lenses. Objective refraction, best corrected visual acuity at distance and near, contrast sensitivity at distance and near, straylight
value, accommodative response, monocular commodative facility, binocular accommodative facility, near point of accommodation using push-up method and pull-away method, negative and positive fusional vergence at near,
pursuits eye movement, saccadic eye movement, near point of convergence were measured. Subjective satisfaction according to visual acuity and reduce
or increase the feeling of fatigue by wearing multifocal SCLs, a cause of discomfort, preference were investigated by using a questionnaire.
Results: There were no statistically significant differences in corrected visual acuity at distance and near. Low contrast sensitivity at near was decreased after wearing multifocal SCLs though the results were not statistically
significant. In relation to straylight(t=-2.86, p=0.005**), accommodative response at 40 cm(t=-5.92, p=0.000***), monocular accommodative facility(t=-2.31, p=0.024*), binocular accommodative facility(t=-2.58, p=0.012*),
measured values at each test were higher in wearing multifocal SCLs than in wearing single vision SCLs. And measured values of near point of accommodation test were shorter in wearing multifocal SCLs than in wearing
single vision SCLs(t=3.18, p=0.002**). Negative and positive fusional vergence reserve at near were increased in wearing multifocal SCLs than in wearing single vision SCLs though the results were not statistically significant.
According to a survey carried out in this study, in relation to satisfaction of visual acuity wearing multifocal SCLs was better than wearing single vision SCLs at near. However, in general, wearing single vision SCLs were preferred in near and far distance. There were no statistically significant
differences in reduce in the feeling of fatigue between wearing multifocal SCLs and single vision SCLs. The most likely reason of the discomfort caused by wearing multifocal SCLs than wearing single vision sSCLs were blurred distance vision and dryness.
Conclusions: Even though in wearing for 6 hours a day for 2 week, it is considered that still incomplete Inhibition of the image from incident light through the periphery of the multifocal soft contact lenses may be exist.
therefore straylight and accommodative response values were higher after wearing multifocal soft contact lenses than wearing single vision SCLs, but accommodative facility was increased and near point of accommodation is was shorter due to increased the depth-of-focus owing to ‘near reflex’ caused by the increased accommodative response and decreased spherical aberration caused by aspheric design of lens.
The study suggests that after the adaptation period longer than two weeks, wearing multifocal soft contact lenses were expected to bring positive effects in relation to increased accommodative function and reduced accommodative fatigue related near work to young people in their 20’s having sufficient accommodation.
주제어
#Multifocal Soft Contact Lenses Straylight Accommodation Eye Movement Depth of Focus Accommodative Fatigue
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