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Feasibility investigation of biometry measurements with new device features (Fresnel topography technique)

Feasibility investigation of biometry measurements with new device features (Fresnel topography technique) - Fresnel feasibility investigation

Status
Active, not recruiting
Phases
Unknown
Study type
Interventional
Source
DRKS
Registry ID
DRKS00019894
Enrollment
85
Registered
2020-01-30
Start date
2020-03-03
Completion date
Unknown
Last updated
2025-10-06

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Collection of device raw and data from subjects with different lens stages (natural, artificial) and individual structural features

Interventions

Group 1: Application of Clinical Prototype, application of IOLMaster 700

Sponsors

Carl Zeiss Meditec AG
Lead Sponsor

Eligibility

Sex/Gender
All
Age
18 Years to No maximum

Inclusion criteria

Inclusion criteria: - Able and willing to make the required study visit; - Able and willing to provide consent and follow study instructions; - Patients must have read, understood and signed the informed consent.

Exclusion criteria

Exclusion criteria: 1. Eye drops (tear fluid substitutes) used prior to the measurement (at least 2 hours without eye drops; except mydriatic agents for pupil dilatation). 2. Any performed contact measurements or examinations in which the eye is touched on the same day prior to the investigation measurement. 3. Physical inability to be positioned at the study devices (e.g. torticollis, head tremor, etc.). 4. Permanent insufficient eyelid opening or eyelashes, which partially conceal alignment or keratometry reflections, inhibiting valid measurements (i.e. typical keratometry measurements with 3-4 mm zone should be ensured). 5. Rigid contact lenses wearing within one day prior to the measurement (if worn, lenses should be removed at least one day prior to the measurements). 6. Soft contact lenses wearing within one day prior to the measurement (if worn, lenses should be removed at least one day prior to the measurements). 7. Principal Investigator’s determination that the subject is not suitable due to other medical condition (reasons to be listed on eCRF). 8. Known Pregnancy. 9. Patients who are participating in another ophthalmological clinical study.

Design outcomes

Primary

MeasureTime frame
The primary objective of this investigation is to use the device data from a heterogeneous patient population to develop the algorithm for the biometry (e.g. topography and keratometry) measurements. Device data will be acquired during the investigational measurement visit.

Secondary

MeasureTime frame
no secondary endpoint is foreseen

Countries

Austria

Contacts

Public ContactClaudia Kirbs

Carl Zeiss Meditec AG

claudia.kirbs@zeiss.com+49 3641 2200

Outcome results

None listed

Source: DRKS (via WHO ICTRP) · Data processed: Feb 4, 2026