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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: May 12, 2025

Retinal Vascular Reactivity as Assessed by Optical Coherence Tomography Angiography
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Retinal Vascular Diseases Highlighted by Adaptive Optics Ophthalmoscopy.

Andrada-Elena Mirescu1, Dan George Deleanu2,3, George Baltă2

  • 1"Ovidius" University of Constanţa, Constanţa, Romania.

Romanian Journal of Ophthalmology
|May 7, 2025
PubMed
Summary

Adaptive optics ophthalmoscopy reveals microvascular and photoreceptor changes in diabetic retinopathy and MacTel type 2. This advanced imaging aids in tracking disease progression and early detection of retinal conditions.

Keywords:
AO = adaptive opticsBCVA = best corrected visual acuityDR = diabetic retinopathyFC = fundus camerasLD = lumen diameterMacTel = macular telangiectasiaOCT = optical coherence tomographyROI = regions of interestSHWS = Shack-Hartmann wavefront sensorSLO = scanning laser ophthalmoscopyTD = total vessel diameterWCSA = wall cross-sectional areaWLR = wall-to-lumen ratioWT = wall thicknessadaptive opticsdiabetic retinopathymacular telangiectasiaretinal vascular diseases

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Area of Science:

  • Ophthalmology
  • Medical Imaging
  • Retinal Diseases

Background:

  • Vascular retinal diseases impact microcirculation and photoreceptors.
  • Early detection and monitoring are crucial for managing these conditions.
  • High-resolution in vivo imaging is needed to study retinal microstructure.

Purpose of the Study:

  • To assess retinal microcirculation and photoreceptor parameters using adaptive optics ophthalmoscopy.
  • To investigate the clinical applications of adaptive optics in healthy individuals and patients with vascular retinal diseases.
  • To quantify vascular and photoreceptor changes in diabetic retinopathy and Macular Telangiectasia type 2.

Main Methods:

  • Adaptive optics ophthalmoscopy was employed to achieve 2 µm resolution.
  • Wavefront aberrations were corrected to enhance image quality.
  • The study included healthy volunteers and patients with nonproliferative diabetic retinopathy, proliferative diabetic retinopathy, and Macular Telangiectasia type 2.

Main Results:

  • A higher wall-to-lumen ratio (WLR) was observed in proliferative diabetic retinopathy compared to healthy controls.
  • Cone density was reduced in all quadrants of eyes with proliferative diabetic retinopathy.
  • Macular Telangiectasia type 2 showed irregular cone mosaic with temporal cone loss.

Conclusions:

  • Adaptive optics imaging effectively visualizes retinal microvascular and photoreceptor changes in vascular diseases.
  • This technology aids in tracking diabetic retinopathy progression and detecting early Macular Telangiectasia type 2.
  • Quantifying these parameters enhances the understanding and management of retinal vascular conditions.