Ocular haemodynamics in glaucoma associated with high myopia.

Area of Science:

• Ophthalmology
• Vascular Biology
• Medical Imaging

Background:

• High myopia and glaucoma are significant ophthalmic conditions.
• Ocular blood flow plays a crucial role in the pathogenesis of optic neuropathies.
• Understanding vascular changes in high myopic glaucoma is essential for risk assessment.

Purpose of the Study:

• To investigate ocular blood flow in high myopic and glaucomatous eyes using Color Doppler Imaging (CDI).
• To compare blood flow parameters between different groups: high myopic glaucoma, very myopic non-glaucoma, non-myopic glaucoma, and controls.
• To identify potential vascular risk factors associated with glaucomatous optic neuropathy in severe myopia.

Main Methods:

• Color Doppler Imaging (CDI) was employed to assess ocular hemodynamics.
• Key ocular vessels studied included the Ophthalmic Artery (OA), Short Posterior Ciliary Arteries (SPCAs), and Central Retinal Artery (CRA).
• Parameters measured were peak systolic velocity (SV), end-diastolic velocity (DV), and Pourcelot Resistivity Index, with statistical analysis using t-tests and Bonferroni correction.

Main Results:

• Eyes with glaucoma associated with very severe myopia exhibited abnormalities in OA blood flow systolic velocity.
• These hemodynamic abnormalities were more pronounced in glaucoma patients with high myopia compared to age-matched glaucoma patients without myopia.
• The observed OA blood flow changes suggest a potential vascular risk factor in the pathogenesis of glaucomatous optic neuropathy.

Conclusions:

• Abnormalities in ophthalmic artery blood flow are present in eyes with high myopia and glaucoma.
• These vascular changes may contribute to the development and progression of glaucomatous optic neuropathy.
• CDI is a valuable tool for assessing ocular vascular status and identifying potential risk factors in complex ophthalmic conditions.