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NCT Number: NCT06607705

Changes in Eye Pressure in Glaucoma Patients Treated with Istent Inject W, Monitored by a Contact Lens Sensor

The purpose of this study is to compare the IOP-related fluctuations using the CLS (contact lens sensor) Sensimed Triggerfish in glaucoma patients before and after glaucoma surgery with iStent inject W under physiological conditions and compare these results with a control group of glaucoma patients treated only with hypotensive medical treatment requiring cataract surgery.

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Key information

Conditions

Glaucoma Eye Cataract Eye Diseases Glaucoma Lens Diseases Ocular Hypertension

Age range

18 year and older

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

Hospital Clínic de Barcelona, Barcelona, Spain

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About this study

This is a prospective controlled pre-post intervention study conducted at a Hospital Clínic of Barcelona, a university hospital in Barcelona, Spain. This study will be adhered to the tenets of the Declaration of Helsinki. Informed patient consent and approval by the Institutional Review Board will be obtained prior to study commencement. Study duration is expected to be around 12 months, recruitment period would last between 6 to 8 months and study is expected to be finalized by Jun 2025.

The study will recruit consenting adults (over 18 years old) with unilateral or bilateral primary open-angle glaucoma (POAG) without previous eye surgery, treated with topical anti-glaucoma medications, who need glaucoma surgery with iStent inject W. The investigators will include patients with isolate iStent surgery and patients with combined cataract and iStent surgery. In cases of bilateral glaucoma, the two eyes of the same patient may be included consecutively.

One month prior to glaucoma surgery with iStent inject W, subjects will wear the CLS for 24 hours without changing the regimen of anti-glaucoma eye drops. The CLS will be placed on the subject's eye by an ophthalmologist in the clinic after a slit lamp examination and keratometry to determine the corneal curvature for selection of the appropriate CLS base curve. The subjects will then return home and carry on their routine activities (both indoor and outdoor), apart from showering or swimming (as the device cannot be in contact with water). Subjects will continue the same regimen of anti-glaucoma eye drops and slept in their habitual position at night. Each subject will carry a logbook to record sleeping and medication instillation times during the 24-hour period. After 24 hours, the subject will return to the clinic to have the contact lens removed followed by a slit lamp examination. The data recorded by the CLS will be uploaded into a computer database. Goldmann applanation tonometry (GAT) will be perform before and after each CLS wear by a single observer. At 1-month (n=9/44) and 3-month (n=44) post-glaucoma surgery with iStent implant, patients will wear the CLS in the same eye that received the first CLS recording. As before, the CLS will be removed 24 hours later. To extend the follow-up to 3 months after surgery will allow us to corroborate that the effects of the surgery on fluctuations of IOP for 24 hours are maintained over time. In the control group (n=10) , a first monitoring with CLS will be carried out one month before cataract surgery, and a second monitoring will be carried out 3 months after this cataract surgery, without us having introduced any changes in their hypotensive medical treatment.

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Adult Patients (over 18 years old) with an initial diagnosis of POAG requiring an indication from the patient chart of an untreated IOP of over 21 mm Hg. Diagnosis of NTG requiring an untreated mean diurnal IOP of over 21 mm Hg from diagnosis to enrollment, indicated by the patient chart. Ocular hypertension is defined as a condition in which the IOP was greater than 21 mm Hg in the absence of glaucomatous defects in visual field testing, the normal appearance of the optic disc and nerve fiber layer, anatomic normality, open angles in gonioscopy, and the absence of ocular conditions contributing to the elevation of pressure, such as narrow angles, neovascular conditions, and uveitis.
  • Adult Patients (over 18 years old ) diagnosed with POAG and NTG are defined as those with open normal appearing angles, typical glaucomatous optic atrophy (i.e., neural rim thinning, notching, saucerization, or nerve fiber layer disc haemorrhage), and typical glaucomatous visual field damage (i.e., arcuate, paracentral scotoma, or nasal step).
  • Adult Patients (age over 18 years old ):

with unilateral or bilateral open-angle glaucoma (POAG) without previous eye surgery, treated with topical anti-glaucoma medications, who need glaucoma surgery with iStent inject W. The investigators will include patients with isolate iStent surgery and patients with combined cataract and iStent surgery. In cases of bilateral glaucoma, the two eyes of the same patient may be included consecutively.

For the control group only: Patients with topical hypotensive glaucoma treatment requiring cataract surgery.

Exclusion criteria

  • Age under 18 years
  • Visual defects attributable to nonglaucomatous conditions, primary angle closure glaucoma, neovascular glaucoma, history of ocular trauma, retinal disease or ocular inflammation, and laser therapy or secondary glaucoma.
  • The patients have to meet best-corrected Snellen visual acuity of under 0.3 and spherical equivalent of under 6 diopter.
  • We will not include patients with previous ocular surgery, except cataract surgery performed at least 6 months prior to the inclusion date.

Treatment and study plan

Monitoring with contact lens sensor

Device

Monitoring with contact lens sensor at 1-month pre-intervention visit

Primary outcomes

  1. IOP-related fluctuation over a 24- hour period

    Time frame: 24 hours during 1-month pre-intervention visit, 24 hours during 1-month post-intervention visit and 24 hours during 3-month post-intervention visit

    The amplitude of the cosine curve is a parameter based on the cosine model fitted to the CLS data. The amplitude is the difference between the maximum and minimum values of the cosine-fit curve divided by 2. This is an overall estimate of the magnitude of signal oscillation during the tested period. The cosinor model represents the actual amplitude of IOP-related fluctuation over a 24- hour period and is most representative of IOP-related changes.

    IOP-related fluctuations will be calculated based on the GAT IOP measured at baseline and at each visit during the study.

    Control group will not be monitored in the 1-month visit.

  2. CLS increase and decrease rates

    Time frame: 24 hours during 1-month pre-intervention visit, 24 hours during 1-month post-intervention visit and 24 hours during 3-month post-intervention visit

    CLS (Contact Lens Sensor) increase and decrease rates (change in CLS units/ change in time): maximum

    Control group will not be monitored in the 1-month visit.

  3. CLS increase and decrease rates

    Time frame: 24 hours during 1-month pre-intervention visit, 24 hours during 1-month post-intervention visit and 24 hours during 3-month post-intervention visit

    CLS (Contact Lens Sensor) increase and decrease rates (change in CLS units/ change in time): minimum.

    Control group will not be monitored in the 1-month visit.

  4. CLS increase and decrease rates

    Time frame: 24 hours during 1-month pre-intervention visit, 24 hours during 1-month post-intervention visit and 24 hours during 3-month post-intervention visit

    CLS (Contact Lens Sensor) increase and decrease rates (change in CLS units/ change in time): median.

    Control group will not be monitored in the 1-month visit.

  5. CLS increase and decrease rates

    Time frame: 24 hours during 1-month pre-intervention visit, 24 hours during 1-month post-intervention visit and 24 hours during 3-month post-intervention visit

    CLS (Contact Lens Sensor) increase and decrease rates (change in CLS units/ change in time): mean.

    Control group will not be monitored in the 1-month visit.

  6. Sleep-to-wake slope

    Time frame: 24 hours during 1-month pre-intervention visit, 24 hours during 1-month post-intervention visit and 24 hours during 3-month post-intervention visit

    Calculation of sleep-to-wake slope.

    Control group will not be monitored in the 1-month visit.

  7. Wake-to-sleep slope

    Time frame: 24 hours during 1-month pre-intervention visit, 24 hours during 1-month post-intervention visit and 24 hours during 3-month post-intervention visit

    Calculation of wake-to-sleep slope.

    Control group will not be monitored in the 1-month visit.

  8. Number of peaks of IOP-related fluctuations

    Time frame: 24 hours during 1-month pre-intervention visit, 24 hours during 1-month post-intervention visit and 24 hours during 3-month post-intervention visit

    Number of peaks: over 24 hours, inferior to 30 minutes, superior to 90mVeq.

    Control group will not be monitored in the 1-month visit.

Study contacts

Contact information is provided by the study sponsor or research team.

María García

CONTACT

[email protected]

+34 645089918

Sponsors and collaborators

Lead sponsor

Fundacio Privada Mon Clinic Barcelona

Other

Collaborators

  • Glaukos Corporation

Registry information

Official study title

Fluctuations of the Intraocular Pressure in Surgically Treated Glaucoma Patients with IStent Inject W by a Contact Lens Sensor

Important dates

Study start
2024
Primary completion
2025
Study completion
2025
First posted
Sep 23, 2024
Registry last updated
Mar 6, 2025

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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