Investigation of the performance of the menifocal Z gas-permeable bifocal contact lens during continuous wear

Lakkis, Carol, Goldenberg, Silvia A. and Woods, Craig A. 2005, Investigation of the performance of the menifocal Z gas-permeable bifocal contact lens during continuous wear, Optometry and vision science, vol. 82, no. 12, pp. 1022-1029, doi: 10.1097/01.opx.0000192345.30084.23.

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Title Investigation of the performance of the menifocal Z gas-permeable bifocal contact lens during continuous wear
Author(s) Lakkis, Carol
Goldenberg, Silvia A.
Woods, Craig A.ORCID iD for Woods, Craig A.
Journal name Optometry and vision science
Volume number 82
Issue number 12
Start page 1022
End page 1029
Total pages 8
Publisher Lippincott Williams & Wilkins
Place of publication Philadelphia, Pa.
Publication date 2005-12
ISSN 1040-5488
Keyword(s) gas-permeable contact lens
continuous wear
hyper-Dk material
bifocal contact lens
Summary Purpose. The Menifocal Z is an alternating vision, concentric, bifocal gas-permeable (GP) contact lens; center distance is connected to near periphery by a smooth transition zone. The lens is produced using tisilfocon A (Menicon Z material), which is approved for up to 30 days of continuous wear (CW). The aim of this study was to evaluate the clinical performance of the Menifocal Z when worn for up to 30 days of CW for 6 months.

Methods. Thirty-five existing GP lens wearers were enrolled in the study. Subjects were fitted with Menifocal Z lenses and follow-up visits were conducted after 2 weeks of daily wear and 1 day, 1 week, 6 weeks, 3 and 6 months of CW. A range of objective and subjective clinical performance measures were assessed, including distance and near visual acuity, the physiological response to CW, and subjective evaluation of vision and comfort.

Results. Twenty-seven subjects (77%) completed the study and eight (23%) discontinued: five (14%) as a result of lens-related problems (four vision, one comfort) and three (9%) as a result of non-lens related reasons. Average CW time achieved by the subjects was 22 ± 2 days. Mean binocular logarithm of the minimum angle of resolution (logMAR) acuities at 6 months were: high contrast distance 0.03 (20/20-), low contrast distance 0.63 (20/80-), and high contrast near 0.26 (20/25, N4). Adverse responses and lens binding were minimal, and there were no significant increases in corneal staining, corneal vascularization, or superior palpebral conjunctival papillae over time (p > 0.05). Problems with night vision (distance and near) with the lenses were the most common difficulties reported by the subjects.

Conclusions. The Menifocal Z appears to be a promising option for presbyopic vision correction, providing successful correction of distance and near vision in a group of experienced GP lens wearers. The hyper Dk tisilfocon A (Menicon Z) material allowed for safe wear of the lenses on a CW basis.
Language eng
DOI 10.1097/01.opx.0000192345.30084.23
Field of Research 119999 Medical and Health Sciences not elsewhere classified
Socio Economic Objective 970111 Expanding Knowledge in the Medical and Health Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2005, American Academy of Optometry
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Document type: Journal Article
Collections: Faculty of Health
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