Advanced optical imaging for cellular-resolution studies of the living retina and biological tissues.

 

Human retinal cone photoreceptors imaging using the AO-RSO (Adaptive Optics Rolling Slit Ophthalmoscope) system. Color codes the cone density.

 

Vascular network using high-speed motion phase contrast imaging in the living human retina. Color codes the red blood cell rate (counts/second)

 

In-vivo human retinal vascular plexuses at different depths (color-coded) using motion phase contrast imaging.

 

AO-RSO phase-contrast modality allows to image vessel wall and precisely assess light-induced vasodilation in the neurovascular coupling process in the living human retina.

 

Full-Field OCT image of cone photoreceptors over a field of view of 5° before and after wavefront optimization for only 3 Zernike modes. Color codes the cone photoreceptor density.

 

Images acquired at the same location, but at different depths in the human retina using Full-Field OCT. Left: Cone photoreceptors. Right: Nerve fiber layer.

Welcome to Clarity Research Group

The CLARITY Research Group at Institut Langevin (ESPCI Paris, CNRS, PSL University), led by Pedro Mecê and Olivier Thouvenin, develops advanced label-free optical imaging technologies to investigate the living human retina and biological tissues at cellular resolution. The group focuses on accessing structural, dynamic, and functional information in vivo by pushing the limits of interferometric and phase-contrast imaging.

At the interface of optical physics and biomedical research, CLARITY designs new imaging architectures aimed at revealing neuronal and vascular activity with high spatial and temporal precision. Current research applies these methods to characterize retinal neurovascular coupling, investigating light-evoked neuronal and vascular responses as potential early biomarkers of Alzheimer’s disease (ERC project MIRACLE-AD). The group also develops label-free approaches to probe cellular dynamics in retinal organoids and other biological tissues.

PhD defense: Inès Loukili successfully defends her PhD thesisNews

PhD defense: Inès Loukili successfully defends her PhD thesis

Inès Loukili has successfully defended her PhD thesis entitled “Study of temporal and spatial coherence for structural and functional imaging…
PhD defense: Dimitri Roueff successfully defends his PhD thesisNews

PhD defense: Dimitri Roueff successfully defends his PhD thesis

Dimitri Roueff has successfully defended his PhD thesis entitled “Development of illumination and detection methods for fast and specific volumetric…
Pedro Mecê, ERC Starting Grant 2025 LaureateNews

Pedro Mecê, ERC Starting Grant 2025 Laureate

Pedro Mecê, CNRS researcher at Institut Langevin and leader of the CLARITY Group, has been awarded a prestigious European Research…
The retina as a window to the brain: revealing retinal neurovascular coupling with cellular-scale precisionNews

The retina as a window to the brain: revealing retinal neurovascular coupling with cellular-scale precision

Researchers from the CLARITY Group at Institut Langevin (ESPCI Paris, CNRS, PSL University), in collaboration with Quinze-Vingts National Eye Hospital…

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