Interocular difference in progression of glaucoma correlates with interocular differences in retrobulbar circulation

Area of Science:

• Ophthalmology
• Glaucoma Research
• Vascular Biology

Background:

• Glaucoma is a leading cause of irreversible blindness.
• Understanding factors influencing asymmetric disease progression is crucial.
• Retrobulbar hemodynamics may play a role in glaucoma pathogenesis.

Purpose of the Study:

• To investigate the relationship between asymmetric glaucoma progression and blood flow differences between the eyes.
• To determine if interocular differences in retrobulbar blood flow correlate with interocular differences in glaucomatous damage progression.

Main Methods:

• Retrospective analysis of visual fields in 20 primary open-angle glaucoma patients.
• Calculation of interocular difference in visual field damage progression (angle gamma).
• Multiple linear regression analysis of angle gamma with interocular differences in intraocular pressure and retrobulbar color Doppler imaging parameters.

Main Results:

• Larger interocular differences in glaucoma progression correlated with lower ophthalmic artery mean blood flow velocity (r = -.69) and higher central retinal artery resistivity index (r =.48).
• Higher peak systolic velocities in the ophthalmic artery were also noted with greater damage asymmetry (r =.52).
• No significant relationship was found between visual field damage progression asymmetry and intraocular pressure or the extent of visual field damage.

Conclusions:

• Interocular differences in the progression of glaucomatous visual field damage are associated with interocular differences in retrobulbar hemodynamic parameters.
• This correlation exists independently of the degree of interocular damage difference and intraocular pressure.
• Retrobulbar blood flow parameters may serve as indicators for asymmetric glaucoma progression.