Assessment of the <scp>T</scp>riggerfish<sup>™</sup> contact lens sensor for measurement of intraocular pressure variations

Sunaric-Mégevand, Gordana; Leuenberger, P; Preußner, Paul-Rolf

doi:10.1111/aos.12455

Cited by 18 publications

(17 citation statements)

References 6 publications

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“…This correlation may not be present in the human eye where other factors such as movements of the eye/eyelids may also affect the corneal curvature (Sunaric‐Megevand et al. ).…”

Section: Discussionsupporting

confidence: 58%

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Can the SENSIMED Triggerfish^® lens data be used as an accurate measure of intraocular pressure?

Vitish-Sharma

Acheson

Stead

et al. 2017

Acta Ophthalmologica

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“…This correlation may not be present in the human eye where other factors such as movements of the eye/eyelids may also affect the corneal curvature (Sunaric‐Megevand et al. ).…”

Section: Discussionsupporting

confidence: 58%

“…The CLS output relies on proportional corneal curvature change with IOP and was initially adapted and tested on enucleated pig eyes (Leonardi et al 2009). This correlation may not be present in the human eye where other factors such as movements of the eye/eyelids may also affect the corneal curvature (Sunaric-Megevand et al 2014).…”

Section: Discussionmentioning

confidence: 96%

Can the SENSIMED Triggerfish^® lens data be used as an accurate measure of intraocular pressure?

Vitish-Sharma

Acheson

Stead

et al. 2017

Acta Ophthalmologica

View full text Add to dashboard Cite

show abstract

“…As such, the CLS measurements cannot be directly compared to conventional measures of IOP. Furthermore, the CLS may exert an external pushing force onto the eye, which could affect ocular dimensions, and it has also been shown to affect CCT, which may have an effect on the data acquired when using the device [27] .…”

Section: Discussionmentioning

confidence: 99%

24-Hour Contact Lens Sensor Monitoring of Intraocular Pressure-Related Profiles in Normal-Tension Glaucoma and Rates of Disease Progression

et al. 2017

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Purpose: To determine the relationship between the rate of glaucomatous visual field loss and the amplitude of a 24-h intraocular pressure (IOP)-related profile measured using a contact lens sensor (CLS). Methods: This observational study included 22 patients with glaucoma and an IOP of consistently ≤21 mm Hg during office hours. All subjects underwent Goldmann tonometry, standard automated perimetry (SAP), dilated fundus examination, and had a CLS recording. A cosine function was used to obtain peak (acrophase), trough (bathyphase), and amplitude measurements. Prior rates of change in SAP mean deviation were calculated and compared to CLS parameters. Results: The patients had a mean (± SD) age of 66.6 ± 8.2 years (range 54-89 years). Mean follow-up was 6.6 ± 5.0 years with 8.3 ± 3.2 reliable SAP tests. The mean rate of change in SAP was -0.86 ± 1.0 dB per year (range -0.11 to -2.12 dB). Regression analysis suggested faster rates of prior visual field loss in eyes with higher-amplitude CLS curves, but this did not reach statistical significance (R² = 0.174, p = 0.053). The CLS accurately identified waking and sleeping periods.59.1% of eyes had a nocturnal acrophase (peaking between 23:00 and 07:00). There was no significant difference in rates of visual field change between patients with nocturnal or diurnal acrophase (-0.71 ± 1.17 and -1.07 ± 0.84 dB/year, respectively, p = 0.437). Conclusion: CLS recordings in patients with normal-tension glaucoma (defined by office hours IOP) indicated that 60% of patients had peak IOP during nocturnal hours, which may not be captured using conventional methods of IOP measurement. Novel parameters obtained using the CLS may provide information for predicting the risk of visual field changes for patients with glaucoma.

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“…A spiraling ring-shaped antenna is best suited for this application as it can loop the periphery of the lens [76]. This type of antenna is already used in the Triggerfish device for health monitoring (shown in Figure 1) [10,77,78]. The antenna is also used as an induction coil to power the device wirelessly.…”

Section: Antenna and Communicationmentioning

confidence: 99%

Switchable Liquid Crystal Contact Lenses for the Correction of Presbyopia

et al. 2018

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Abstract:Presbyopia is an age-related disorder where the lens of the eye hardens so that focusing on near objects becomes increasingly difficult. This complaint affects everyone over the age of 50. It is becoming progressively more relevant, as the average age of the global population continues to rise. Bifocal or varifocal spectacles are currently the best solution for those that require near and far vision correction. However, many people prefer not to wear spectacles and while multifocal contact lenses are available, they are not widely prescribed and can require significant adaptation by wearers. One possible solution is to use liquid crystal contact lenses that can change focal power by applying a small electric field across the device. However, the design of these contact lenses must be carefully considered as they must be comfortable for the user to wear and able to provide the required change in focal power (usually about +2D). Progress towards different lens designs, which includes lens geometry, liquid crystal choices and suitable alignment modes, are reviewed. Furthermore, we also discuss suitable electrode materials, possible power sources and suggest some methods for switching the lenses between near and far vision correction.

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Assessment of the Triggerfish^™ contact lens sensor for measurement of intraocular pressure variations

Cited by 18 publications

References 6 publications

Can the SENSIMED Triggerfish^® lens data be used as an accurate measure of intraocular pressure?

Can the SENSIMED Triggerfish^® lens data be used as an accurate measure of intraocular pressure?

24-Hour Contact Lens Sensor Monitoring of Intraocular Pressure-Related Profiles in Normal-Tension Glaucoma and Rates of Disease Progression

Switchable Liquid Crystal Contact Lenses for the Correction of Presbyopia

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Assessment of the Triggerfish™ contact lens sensor for measurement of intraocular pressure variations

Cited by 18 publications

References 6 publications

Can the SENSIMED Triggerfish® lens data be used as an accurate measure of intraocular pressure?

Can the SENSIMED Triggerfish® lens data be used as an accurate measure of intraocular pressure?

24-Hour Contact Lens Sensor Monitoring of Intraocular Pressure-Related Profiles in Normal-Tension Glaucoma and Rates of Disease Progression

Switchable Liquid Crystal Contact Lenses for the Correction of Presbyopia

Contact Info

Product

Resources

About

Assessment of the Triggerfish^™ contact lens sensor for measurement of intraocular pressure variations

Can the SENSIMED Triggerfish^® lens data be used as an accurate measure of intraocular pressure?

Can the SENSIMED Triggerfish^® lens data be used as an accurate measure of intraocular pressure?