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In an open-loop system, such as a basic thermostat, the poles of the transfer function influence the system's response but do not determine its stability. However, when feedback is introduced to form a closed-loop system, such as an advanced thermostat that adjusts heating based on room temperature, stability is governed by the new poles of the closed-loop transfer function.
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Updated: Feb 13, 2026

Sensitivity Enhancement of Soft Capacitive Pressure Sensors Using a Solvent Evaporation-Based Porosity Control Technique
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[Controlled cyclophotocoagulation (COCO) : What needs to be considered?]

P-R Preußner1

  • 1Augenklinik der Universitätsmedizin, Langenbeckstr.1, 55101, Mainz, Deutschland. pr.preussner@uni-mainz.de.

Der Ophthalmologe : Zeitschrift Der Deutschen Ophthalmologischen Gesellschaft
|March 7, 2018
PubMed
Summary
This summary is machine-generated.

Repeat laser cyclocoagulation is safe and effective for managing intraocular pressure when initial treatments are insufficient. This approach offers predictable outcomes for glaucoma patients requiring sustained IOP control.

Keywords:
Ciliary bodyPressure reductionReal time controlReproducibilityRisk profile

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Area of Science:

  • Ophthalmology
  • Medical Technology

Background:

  • Modern laser cyclocoagulation has limitations in predictable therapeutic success for individual cases.
  • Controlled cyclophotocoagulation (COCO) offers a safer alternative due to high photoabsorption selectivity.

Purpose of the Study:

  • To evaluate the efficacy and safety of repeat controlled cyclophotocoagulation (COCO) for intraocular pressure management.
  • To establish the viability of repeated COCO interventions when initial treatments yield insufficient results.

Main Methods:

  • Utilizing controlled cyclophotocoagulation (COCO) with a focus on high photoabsorption selectivity.
  • Implementing repeat COCO interventions if intraocular pressure reduction is inadequate or pressure rises post-initial treatment.

Main Results:

  • Controlled cyclophotocoagulation (COCO) demonstrates a low likelihood of unwanted damage and complications.
  • Repeat interventions are feasible and maintain the same indications and protocols as initial treatments.

Conclusions:

  • Repeat controlled cyclophotocoagulation (COCO) is a viable and safe option for sustained intraocular pressure control.
  • The predictability of therapeutic success is enhanced through the potential for repeat COCO interventions.