This study seeks to address whether or not different types of daily disposable soft contact lenses may be a beneficial option for patients complaining of eye strain and visual discomfort while using digital devices.
This was a prospective, single site, randomized, double-masked, crossover pilot study. Subjects were randomized to begin with either multifocal or single vision distance contact lenses. The lenses used in this study were the 1-Day Acuvue (AV) Moist spherical single-vision soft contact lenses (SSCL) in the 8.5 base curve and the 1-Day AV Moist Multifocal (MFSCL) in the low ADD (etafilcon A, 58% water content). The preferred viewing distance on digital devices for a similar age group to our study was 63 cm which would require a near ADD of +1.59D. A low addition (ADD) yielding up to +1.25D was selected to provide an intermediate near addition without compromising distance vision as much as would be expected with higher add powers. The multifocal lens utilizes an aspheric center-near design. Subjects wore the lenses on a daily wear, daily disposable schedule. Following one week (± 2 days) of lens wear, subjects were evaluated and the alternate lenses dispensed. Adverse events were collected and assessed at each study visit.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
DOUBLE
Enrollment
23
Worn daily for 7 +/- 2 days
Worn daily for 7 +/- 2 days
SUNY College of Optometry
New York, New York, United States
Subjective Symptom Improvement
The primary outcome measure was change in average score on a ten question Visual Comfort Survey using a Visual Analogue Scale (VAS) from baseline to day 7 in multifocal contact lenses and single vision contact lenses. The Visual Analogue Scale ranges from 0-100 (100 being the worst symptoms) for each of the ten questions. The maximum total score is 1000, the minimum total score is 0 (no symptoms).
Time frame: Baseline and after 1 week of wearing each lens.
Lens Preference
Based on two alternative forced choice method
Time frame: 2 weeks
Lag of Accommodation in Study Lenses
Accommodative response was measured by having subjects switch the right lens to a spherical lens in the appropriate power. This was done for all subjects regardless of which lens they were randomized to, to maintain masking. Subjects wore an infrared filter over the right eye for occlusion and to ensure that they were fixating with the left eye (which was still wearing the lens they were randomized to). This filter allowed for measurements to be taken with the WAM-5500 open field autorefractor in front of the right eye. This method assumes a symmetrical accommodative response between eyes. Since accommodative response was measured monocularly, this eliminated any convergent accommodation, but this was consistent between lenses and test distances. Five measurements were taken at each test distance (distance, 40cm and 25cm). The 5 readings obtained were used to calculate mean spherical equivalent value at each test distance and compared to expected accommodative value to determine lag.
Time frame: 1 week
Convergence Insufficiency Symptom Survey (CISS)
Difference in CISS score after one week of multifocal contact lens use vs single vision contact lens use. Minimum score (least symptoms)= 0. Maximum score (worst symptoms) = 60.
Time frame: 1 week
This platform is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional.
Contact Lens Dry Eye Questionnaire- 8 Survey (CLDEQ-8)
CLDEQ-8 score after one week of multifocal contact lenses vs single vision contact lenses. Minimum value (least symptoms) = 0. Maximum Score= 37 (worst symptoms).
Time frame: 1 week
Near Phoria at 40cm in Multifocal Contact Lens vs Single Vision Contact Lens
Measured via Modified Thorington
Time frame: 1 week