Real World Through Focus Curve of a New Multifocal Contact Lens

Michel Guillon, Kathryn A. Dumbleton, Trisha Patel, Tom Karkkainen Karkkainen, Kurt Moody, Jing Xu, Ron Clark

Research output: Contribution to journalMeeting abstract

Abstract

Purpose : The Through Focus Curve (TFC) is often used to characterise visual performance of multifocal contact lenses (MCL) and intra ocular lenses over a range of defocus. Typically negative lenses are used to produce vergences but this requires accurate lens centration and trial lenses may interfere with binocularity. The objective was to characterize a new MCL using a new clinical test paradigm, measuring visual acuity (VA) at the actual distances of interest, allowing normal convergence and both binocular and monocular measurements.

Methods : Monocular, binocular (B) and binocular summation (BS) TFCs were obtained by measuring logMAR VA at 6 distances (40cm, 50cm, 67cm, 1m, 2m & 4m) for 3 luminances (250cd/m2 daytime and computer use, 50cd/m2 indoor evening & 2.5cd/m2 night driving). The measurements were made with OTG-i Vision using a 4K screen at distance, an iPad 2 Air (retina) for intermediate and an iPad mini (retina) for near, all driven by a dedicated App. The study MCL was 1-DAY ACUVUE® MOIST Brand MULTIFOCAL. The study population (age 51.7 ± 7.37) comprised 7 low, 10 medium and 13 high addition subjects.

Results : (i) Mean BVA at 250cd/m2 was < 0.0 logMAR (>20.20) at all distances. The best BVA was achieved at 2m (-0.19 logMAR 20/13) and the lowest at 40cm (-0.04 logMAR 20/18);
(ii) Mean BVA at 50cd/m2 was lower than at 250cd/m2 by 1 line at distance (+0.1 logMAR), 1.2 lines at intermediate (+0.12 logMAR) and 1.4 lines at near (+0.14 logMAR) maintaining a balanced performance for all distances;
(iii) Mean BVA at 2.5cd/m2 was biased for distance, with 2.5 lines (0.25 logMAR) loss compared with 250cd/m2 giving a mean VA of 20/25;
(iv) Differences in VA between dominant and non-dominant eyes were small, at most 1/3 of a line (mean differences -0.025 to + 0.029 logMAR); with a trend to favour the dominant eye at distance and the non-dominant eye at near;
(v) BS was most marked at distance (mean -0.01 to -0.04 logMAR), demonstrating that the MCL were not biased towards modified monovision maintaining binocularity.

Conclusions : This novel “real world” clinical technique was able to fully characterise the TFC performance of the study MCL, demonstrating excellent performance at high luminance while maintaining balanced VA at all distances at medium luminance and a bias towards distance at low luminance (night driving). In addition monocular and binocular VA measurements have confirmed binocular summation with the MCL.

This is an abstract that was submitted for the 2016 ARVO Annual Meeting, held in Seattle, Wash., May 1-5, 2016.

Original languageEnglish
Article numberA0161
JournalInvestigative Ophthalmology and Visual Science
Volume57
Issue number12
Publication statusPublished - 1 May 2016
Eventarvo 2016 : Annual meeting - Seattle, Washington, United States
Duration: 1 May 20165 May 2016

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Contact Lenses
Visual Acuity
Lenses
Retina
Crystalline Lens
Air
Population

Bibliographical note

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Cite this

Guillon, M., Dumbleton, K. A., Patel, T., Karkkainen Karkkainen, T., Moody, K., Xu, J., & Clark, R. (2016). Real World Through Focus Curve of a New Multifocal Contact Lens. Investigative Ophthalmology and Visual Science, 57(12), [A0161].
Guillon, Michel ; Dumbleton, Kathryn A. ; Patel, Trisha ; Karkkainen Karkkainen, Tom ; Moody, Kurt ; Xu, Jing ; Clark, Ron. / Real World Through Focus Curve of a New Multifocal Contact Lens. In: Investigative Ophthalmology and Visual Science. 2016 ; Vol. 57, No. 12.
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title = "Real World Through Focus Curve of a New Multifocal Contact Lens",
abstract = "Purpose : The Through Focus Curve (TFC) is often used to characterise visual performance of multifocal contact lenses (MCL) and intra ocular lenses over a range of defocus. Typically negative lenses are used to produce vergences but this requires accurate lens centration and trial lenses may interfere with binocularity. The objective was to characterize a new MCL using a new clinical test paradigm, measuring visual acuity (VA) at the actual distances of interest, allowing normal convergence and both binocular and monocular measurements. Methods : Monocular, binocular (B) and binocular summation (BS) TFCs were obtained by measuring logMAR VA at 6 distances (40cm, 50cm, 67cm, 1m, 2m & 4m) for 3 luminances (250cd/m2 daytime and computer use, 50cd/m2 indoor evening & 2.5cd/m2 night driving). The measurements were made with OTG-i Vision using a 4K screen at distance, an iPad 2 Air (retina) for intermediate and an iPad mini (retina) for near, all driven by a dedicated App. The study MCL was 1-DAY ACUVUE{\circledR} MOIST Brand MULTIFOCAL. The study population (age 51.7 ± 7.37) comprised 7 low, 10 medium and 13 high addition subjects. Results : (i) Mean BVA at 250cd/m2 was < 0.0 logMAR (>20.20) at all distances. The best BVA was achieved at 2m (-0.19 logMAR 20/13) and the lowest at 40cm (-0.04 logMAR 20/18);(ii) Mean BVA at 50cd/m2 was lower than at 250cd/m2 by 1 line at distance (+0.1 logMAR), 1.2 lines at intermediate (+0.12 logMAR) and 1.4 lines at near (+0.14 logMAR) maintaining a balanced performance for all distances;(iii) Mean BVA at 2.5cd/m2 was biased for distance, with 2.5 lines (0.25 logMAR) loss compared with 250cd/m2 giving a mean VA of 20/25;(iv) Differences in VA between dominant and non-dominant eyes were small, at most 1/3 of a line (mean differences -0.025 to + 0.029 logMAR); with a trend to favour the dominant eye at distance and the non-dominant eye at near;(v) BS was most marked at distance (mean -0.01 to -0.04 logMAR), demonstrating that the MCL were not biased towards modified monovision maintaining binocularity. Conclusions : This novel “real world” clinical technique was able to fully characterise the TFC performance of the study MCL, demonstrating excellent performance at high luminance while maintaining balanced VA at all distances at medium luminance and a bias towards distance at low luminance (night driving). In addition monocular and binocular VA measurements have confirmed binocular summation with the MCL. This is an abstract that was submitted for the 2016 ARVO Annual Meeting, held in Seattle, Wash., May 1-5, 2016.",
author = "Michel Guillon and Dumbleton, {Kathryn A.} and Trisha Patel and {Karkkainen Karkkainen}, Tom and Kurt Moody and Jing Xu and Ron Clark",
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Guillon, M, Dumbleton, KA, Patel, T, Karkkainen Karkkainen, T, Moody, K, Xu, J & Clark, R 2016, 'Real World Through Focus Curve of a New Multifocal Contact Lens', Investigative Ophthalmology and Visual Science, vol. 57, no. 12, A0161.

Real World Through Focus Curve of a New Multifocal Contact Lens. / Guillon, Michel; Dumbleton, Kathryn A.; Patel, Trisha; Karkkainen Karkkainen, Tom; Moody, Kurt; Xu, Jing; Clark, Ron.

In: Investigative Ophthalmology and Visual Science, Vol. 57, No. 12, A0161, 01.05.2016.

Research output: Contribution to journalMeeting abstract

TY - JOUR

T1 - Real World Through Focus Curve of a New Multifocal Contact Lens

AU - Guillon, Michel

AU - Dumbleton, Kathryn A.

AU - Patel, Trisha

AU - Karkkainen Karkkainen, Tom

AU - Moody, Kurt

AU - Xu, Jing

AU - Clark, Ron

N1 - This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

PY - 2016/5/1

Y1 - 2016/5/1

N2 - Purpose : The Through Focus Curve (TFC) is often used to characterise visual performance of multifocal contact lenses (MCL) and intra ocular lenses over a range of defocus. Typically negative lenses are used to produce vergences but this requires accurate lens centration and trial lenses may interfere with binocularity. The objective was to characterize a new MCL using a new clinical test paradigm, measuring visual acuity (VA) at the actual distances of interest, allowing normal convergence and both binocular and monocular measurements. Methods : Monocular, binocular (B) and binocular summation (BS) TFCs were obtained by measuring logMAR VA at 6 distances (40cm, 50cm, 67cm, 1m, 2m & 4m) for 3 luminances (250cd/m2 daytime and computer use, 50cd/m2 indoor evening & 2.5cd/m2 night driving). The measurements were made with OTG-i Vision using a 4K screen at distance, an iPad 2 Air (retina) for intermediate and an iPad mini (retina) for near, all driven by a dedicated App. The study MCL was 1-DAY ACUVUE® MOIST Brand MULTIFOCAL. The study population (age 51.7 ± 7.37) comprised 7 low, 10 medium and 13 high addition subjects. Results : (i) Mean BVA at 250cd/m2 was < 0.0 logMAR (>20.20) at all distances. The best BVA was achieved at 2m (-0.19 logMAR 20/13) and the lowest at 40cm (-0.04 logMAR 20/18);(ii) Mean BVA at 50cd/m2 was lower than at 250cd/m2 by 1 line at distance (+0.1 logMAR), 1.2 lines at intermediate (+0.12 logMAR) and 1.4 lines at near (+0.14 logMAR) maintaining a balanced performance for all distances;(iii) Mean BVA at 2.5cd/m2 was biased for distance, with 2.5 lines (0.25 logMAR) loss compared with 250cd/m2 giving a mean VA of 20/25;(iv) Differences in VA between dominant and non-dominant eyes were small, at most 1/3 of a line (mean differences -0.025 to + 0.029 logMAR); with a trend to favour the dominant eye at distance and the non-dominant eye at near;(v) BS was most marked at distance (mean -0.01 to -0.04 logMAR), demonstrating that the MCL were not biased towards modified monovision maintaining binocularity. Conclusions : This novel “real world” clinical technique was able to fully characterise the TFC performance of the study MCL, demonstrating excellent performance at high luminance while maintaining balanced VA at all distances at medium luminance and a bias towards distance at low luminance (night driving). In addition monocular and binocular VA measurements have confirmed binocular summation with the MCL. This is an abstract that was submitted for the 2016 ARVO Annual Meeting, held in Seattle, Wash., May 1-5, 2016.

AB - Purpose : The Through Focus Curve (TFC) is often used to characterise visual performance of multifocal contact lenses (MCL) and intra ocular lenses over a range of defocus. Typically negative lenses are used to produce vergences but this requires accurate lens centration and trial lenses may interfere with binocularity. The objective was to characterize a new MCL using a new clinical test paradigm, measuring visual acuity (VA) at the actual distances of interest, allowing normal convergence and both binocular and monocular measurements. Methods : Monocular, binocular (B) and binocular summation (BS) TFCs were obtained by measuring logMAR VA at 6 distances (40cm, 50cm, 67cm, 1m, 2m & 4m) for 3 luminances (250cd/m2 daytime and computer use, 50cd/m2 indoor evening & 2.5cd/m2 night driving). The measurements were made with OTG-i Vision using a 4K screen at distance, an iPad 2 Air (retina) for intermediate and an iPad mini (retina) for near, all driven by a dedicated App. The study MCL was 1-DAY ACUVUE® MOIST Brand MULTIFOCAL. The study population (age 51.7 ± 7.37) comprised 7 low, 10 medium and 13 high addition subjects. Results : (i) Mean BVA at 250cd/m2 was < 0.0 logMAR (>20.20) at all distances. The best BVA was achieved at 2m (-0.19 logMAR 20/13) and the lowest at 40cm (-0.04 logMAR 20/18);(ii) Mean BVA at 50cd/m2 was lower than at 250cd/m2 by 1 line at distance (+0.1 logMAR), 1.2 lines at intermediate (+0.12 logMAR) and 1.4 lines at near (+0.14 logMAR) maintaining a balanced performance for all distances;(iii) Mean BVA at 2.5cd/m2 was biased for distance, with 2.5 lines (0.25 logMAR) loss compared with 250cd/m2 giving a mean VA of 20/25;(iv) Differences in VA between dominant and non-dominant eyes were small, at most 1/3 of a line (mean differences -0.025 to + 0.029 logMAR); with a trend to favour the dominant eye at distance and the non-dominant eye at near;(v) BS was most marked at distance (mean -0.01 to -0.04 logMAR), demonstrating that the MCL were not biased towards modified monovision maintaining binocularity. Conclusions : This novel “real world” clinical technique was able to fully characterise the TFC performance of the study MCL, demonstrating excellent performance at high luminance while maintaining balanced VA at all distances at medium luminance and a bias towards distance at low luminance (night driving). In addition monocular and binocular VA measurements have confirmed binocular summation with the MCL. This is an abstract that was submitted for the 2016 ARVO Annual Meeting, held in Seattle, Wash., May 1-5, 2016.

M3 - Meeting abstract

VL - 57

JO - Investigative Ophthalmology and Visual Science

JF - Investigative Ophthalmology and Visual Science

SN - 1552-5783

IS - 12

M1 - A0161

ER -

Guillon M, Dumbleton KA, Patel T, Karkkainen Karkkainen T, Moody K, Xu J et al. Real World Through Focus Curve of a New Multifocal Contact Lens. Investigative Ophthalmology and Visual Science. 2016 May 1;57(12). A0161.