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Related Concept Videos

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Ophthalmic drug delivery faces major limitations due to poor absorption across the corneal membrane. This process is primarily driven by diffusion and is influenced by two main factors: the physicochemical properties of the drug and tear drainage. Most ophthalmic drugs, such as pilocarpine, epinephrine, atropine, and local anesthetics, are weak bases. They are typically formulated at an acidic pH to enhance chemical stability. However, this leads to high ionization, reducing their ability to...
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In open-angle glaucoma, the iridocorneal angle remains open, but the trabecular meshwork becomes stiff, slowing down the outflow of aqueous humor. This causes a buildup of aqueous humor in the anterior chamber, leading to a sudden increase in intraocular pressure. The treatment for open-angle glaucoma focuses on reducing the elevated intraocular pressure by either decreasing the secretion of aqueous humor or increasing its outflow.
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Glaucoma is an eye condition characterized by increased intraocular pressure that damages the retina and optic nerve, leading to irreversible blindness if left untreated. The human eye has various components, including the cornea, iris, pupil, lens, and optic nerve. Aqueous humor is secreted by the epithelium of the ciliary body in the posterior chamber and flows through the trabecular meshwork and canal of Schlemm, maintaining normal intraocular pressure. The trabecular meshwork and the canal...
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Related Experiment Video

Updated: Apr 10, 2026

Translaminar Autonomous System Model for the Modulation of Intraocular and Intracranial Pressure in Human Donor Posterior Segments
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Modular Control of PEG-Poly(2-Oxazoline) Co-Assembly Enables Tunable Aggregate Properties for Intraocular Pressure

Yuji Tanaka1,2, Shohei Morikawa3, Shigehito Osawa2,4

  • 1Age-Adaptive Project for Centenarian Mobility, New Industry Creation Hatchery Center (NICHe), Tohoku University, Sendai, Miyagi, Japan.

Advanced Healthcare Materials
|April 9, 2026
PubMed
Summary

This study introduces a new injectable polymer formulation (POx2P) that temporarily increases intraocular pressure. This innovative approach offers a potential solution for managing hypotony after eye surgery.

Keywords:
biomedical applicationshypotonyintraocular pressureophthalmologypolymers

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Area of Science:

  • Biomaterials Science
  • Ophthalmology
  • Polymer Chemistry

Background:

  • Postoperative hypotony lacks effective treatments, necessitating new therapeutic strategies.
  • Poly(2-oxazoline) (POx) polymers offer tunable, biocompatible properties for biomedical applications.

Purpose of the Study:

  • To develop a minimally invasive, controllable method for temporary intraocular pressure restoration.
  • To create a thermo-responsive polymer system for localized intraocular therapy.

Main Methods:

  • Co-assembly of thermoswitchable poly(2-n-propyl-2-oxazoline) (PnPrOx) with PnPrOx-PEG.
  • In vivo compositional screening in rabbits to identify optimal formulation (POx2P).
  • Evaluation in a trabeculectomy-induced hypotony model.

Main Results:

  • The POx2P formulation aggregates at physiological temperatures, inducing transient intraocular pressure elevation.
  • Successful restoration of intraocular pressure in a hypotony model without adverse effects.
  • In vivo imaging indicated flow-responsive aggregates transiently occluding aqueous outflow pathways.

Conclusions:

  • A compositionally tunable, injectable POx platform was established for in situ aggregation and pressure modulation.
  • This platform offers a clinically relevant approach for localized intraocular therapy.
  • The POx2P formulation shows promise for treating postoperative hypotony.