This composite educational resource illustrates an early-onset glaucoma phenotype in a mouse model (Pitx2egl1) compared to wild-type (Pitx2WT). Panel A contains a bar graph showing longitudinal intraocular pressure (IOP) data at 1, 2, 6, and 12 months. Pitx2egl1 mice exhibit significantly elevated IOP (peaking around 30 mmHg at 6 months) compared to the stable ~18 mmHg in controls. Panel B displays longitudinal diagnostic imaging, combining fundus photography and Optical Coherence Tomography (OCT). In mutants, fundus images reveal a characteristic partial white ring around the optic cup, while OCT B-scans demonstrate progressive optic nerve cupping and excavation starting as early as 2 months. Panel C presents H&E-stained histological sections of the optic nerve head at 12 months. The mutant section shows severe glaucomatous cupping (excavation) and thinning of the inner retinal layers, specifically the retinal nerve fiber layer (RNFL), compared to the healthy morphology of the wild-type. This visual summarizes the clinical signs of hypertensive glaucoma including elevated IOP, structural optic disc changes, and neurodegeneration.

This composite image illustrates diagnostic findings of primary open-angle glaucoma through multimodal ophthalmic imaging. Panel A is a fundus photograph displaying a glaucomatous optic disc characterized by a large vertical cup-to-disc ratio, significant central excavation (cupping), and thinning of the neuroretinal rim, particularly in the superior and inferior poles. Panel B presents a vertical Optical Coherence Tomography (OCT) B-scan of the optic nerve head, measuring the distance (α = 406 µm) between the Bruch's membrane opening (BMO) reference line and the anterior surface of the lamina cribrosa. Panel C shows a circular OCT scan and accompanying quantitative analysis of the circumpapillary retinal nerve fiber layer (cpRNFL). The analysis indicates a significantly reduced mean cpRNFL thickness of 58 µm. The included TSNIT (Temporal, Superior, Nasal, Inferior, Temporal) thickness graph and color-coded sectoral map demonstrate thinning outside normal limits (red sectors), particularly in the superior and nasal regions. This clinical case highlights the correlation between structural optic disc changes and the quantitative loss of the retinal nerve fiber layer in glaucomatous neuropathy.

A multi-panel comparison chart using fundus photography, OCT, and OCT angiography (OCTA) to differentiate between Branch Retinal Vein Occlusion (BRVO, top row A-E) and Normal-Tension Glaucoma (NTG, bottom row F-J). Panels A and F show optic disc morphology; BRVO displays focal superior disc notching and retinal nerve fiber layer (RNFL) defects, while NTG shows more generalized and deeper disc cupping. Panels B and G provide circular sector maps of RNFL thickness. Panels C, D, H, and I are en-face OCTA scans of the superficial capillary plexus and choriocapillaris. In BRVO (C), there is a significant focal decrease in peripapillary vessel density in the superotemporal segment corresponding to the site of occlusion. In NTG (H, I), there is a more diffuse reduction in vessel density, particularly in the choriocapillaris layer. Cross-sectional Swept-Source OCT B-scans (E, J) illustrate the lamina cribrosa (LC). The BRVO eye exhibits focal, irregular LC thinning (white arrow), whereas the NTG eye demonstrates deeper, more uniform disc cupping and generalized LC structural changes.

This medical comparison image displays fundus color photographs and corresponding swept-source optical coherence tomography (OCT) scans for three phenotypes of age-related macular degeneration (AMD): soft drusen, subretinal drusenoid deposits (SDDs), and pachydrusen.

This composite clinical figure illustrates diagnostic findings for age-related macular degeneration (AMD). (a) Color fundus photograph of a healthy eye showing a normal optic disc, clear macular region, and standard vascular distribution. (b) Color fundus photograph of a patient with atrophic AMD, demonstrating geographic atrophy in the macula, characterized by a well-demarcated area of depigmentation, alongside multiple yellowish drusen deposits. (c) Optical Coherence Tomography (OCT) imaging of an AMD patient. The left panel shows a grayscale fundus infrared reflectance image with visible drusen; the right panel presents a cross-sectional Spectral-Domain OCT (SD-OCT) scan. The scan reveals characteristic pathology including thinning of the retinal layers, disruption of the retinal pigment epithelium (RPE) and photoreceptor layers, and sub-RPE deposits (drusen). (d) Comparison chart detailing demographic and clinical data for six AMD patients and six control subjects, including age at diagnosis and disease laterality. The image serves as an educational resource for identifying clinical signs of non-exudative (dry) AMD across different imaging modalities.

A multi-modal ophthalmic diagnostic image demonstrating calcified drusen in age-related macular degeneration (AMD). The left panel is a Color Fundus Photograph (CFP) showing a wide-field view of the retina with numerous yellow-white subretinal deposits concentrated in the macular region. A magnified inset (indicated by a white arrow) highlights a specific druse with a glistening, bright white appearance, characteristic of calcification. The right panel is a corresponding Optical Coherence Tomography (OCT) cross-section of the retina. The OCT demonstrates focal elevations of the retinal pigment epithelium (RPE) layer. The arrow indicates a specific calcified druse characterized by a heterogeneous, hyperreflective internal structure located between the RPE and Bruch's membrane. This hyperreflectivity suggests a high-density crystalline or mineralized composition. Clinically, such calcification is often associated with drusen regression and a higher risk of progression to geographic atrophy (GA). The image serves as an educational tool for distinguishing drusen subtypes based on reflectivity and fundus appearance.

This clinical photograph of a human fundus illustrates hard exudates in a circinate pattern, a classic finding in diabetic retinopathy. The image shows numerous small, yellowish-white, well-defined deposits of lipid and protein within the retina. These exudates are arranged in a roughly circular or ring-like (circinate) formation, often indicating a central cluster of leaking microaneurysms or damaged retinal capillaries. The background retina appears reddish-orange with visible branching retinal vasculature. In addition to the hard exudates, subtle dark red spots are visible, representing intraretinal hemorrhages or microaneurysms. This visual is characteristic of clinically significant macular edema or non-proliferative diabetic retinopathy, where chronic vascular permeability leads to the accumulation of these lipoprotein residues. The contrast between the bright, refractile exudates and the darker retinal background highlights the pathological distribution useful for teaching diagnostic ophthalmology and diabetic eye disease management.

This diagnostic image displays a color fundus photograph of a human retina, highlighting clinical manifestations of diabetic retinopathy. The image is presented in two panels: (a) a wide-field view of the posterior pole and (b) a magnified view focusing on specific retinal lesions (RLs). Visible anatomical landmarks include the optic disc on the right, the macula centrally, and the branching retinal vasculature. Pathological findings consist of multiple bright, yellowish-white hard exudates clustered in the macula and paramacular regions. These exudates appear as granular or homogeneous deposits with varied morphologies. Interspersed among these are dark red, punctate microaneurysms and small hemorrhages. Cyan-colored digital contours outline definitively detected lesions, demonstrating an automated segmentation approach for diabetic lesion classification. The image serves as an educational tool for ophthalmology, specifically for identifying and segmenting vascular complications and lipid deposits associated with chronic retinal disease. The clinical focus is on the detection and differentiation of microaneurysms and exudates within a non-proliferative diabetic retinopathy context.

This composite figure illustrates the Merged Image-Guided Photocoagulation (MIG-PC) protocol for treating focal diabetic macular edema (DME). The sequence comprises: (a) A color ocular fundus photograph showing focal DME characterized by a circinate ring of yellowish hard exudates in the macula. (b) An Optical Coherence Tomography (OCT) thickness map overlaid on the fundus photograph, with red/white areas indicating significant retinal thickening. (c) Integration of Fluorescein Angiography (FA) with the OCT map and fundus image to identify leakage points. (d) A high-magnification view of the target area, showing the spatial relationship between the thickened retina and underlying vascular leakage. (e) Final marking of microaneurysms (MAs) with yellow circular annotations to guide laser photocoagulation. The pedagogical focus is the multi-modal integration of diagnostic imaging (OCT, FA, and fundus photography) to enhance the precision of laser treatment for diabetic retinopathy. Key structures include the macula, retinal vasculature, and pathological features like hard exudates and microaneurysms.