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Related Concept Videos

Ophthalmic Drug Delivery Systems01:23

Ophthalmic Drug Delivery Systems

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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Modified-Release Drug Delivery Systems: Stimuli-Activated

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Related Experiment Video

Updated: Jun 22, 2026

Optimized Minimally Invasive Transscleral Subretinal Injection Technique in Mouse
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Published on: July 25, 2025

Retinally stabilized cone-targeted stimulus delivery.

David W Arathorn, Qiang Yang, Curtis R Vogel

    Optics Express
    |June 25, 2009
    PubMed
    Summary
    This summary is machine-generated.

    We precisely project visual stimuli onto the retina using real-time eye motion tracking and a scanning laser, achieving sub-micron accuracy. This technique also corrects image distortions in adaptive optics scanning laser ophthalmoscopy (AOSLO).

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    Area of Science:

    • Ophthalmology and Vision Science
    • Optical Engineering
    • Neuroscience

    Background:

    • Accurate visual stimulus presentation is crucial for understanding retinal function.
    • Retinal image motion and optical aberrations pose significant challenges for high-resolution imaging and stimulation.
    • Adaptive optics scanning laser ophthalmoscopy (AOSLO) offers potential for in vivo retinal research but requires precise motion and aberration correction.

    Purpose of the Study:

    • To demonstrate highly stabilized, aberration-corrected visual stimulus projection directly onto the retina.
    • To achieve unprecedented spatial accuracy in retinal stimulus delivery.
    • To implement real-time correction of image distortions within AOSLO.

    Main Methods:

    • Utilized real-time retinal image motion signals to guide stimulus projection.
    • Employed high-speed modulation of a scanning laser for precise stimulus delivery.
    • Integrated real-time image distortion correction within the AOSLO system.

    Main Results:

    • Achieved stimulus location accuracy averaging 0.26 arcminutes (approx. 1.3 microns) in subjects with good fixation.
    • Demonstrated accuracy smaller than cone-to-cone spacing at the fovea.
    • Showcased real-time correction of AOSLO image distortions with intraframe accuracy of approximately 7 arcseconds.

    Conclusions:

    • This method enables highly precise and stabilized retinal stimulus projection.
    • The achieved accuracy surpasses the resolution limits of individual photoreceptors.
    • Real-time aberration correction enhances the fidelity of AOSLO imaging and potential stimulation.