Primary Open-Angle Glaucoma Suspect Diagnosis and Management

Introduction to POAG Diagnosis

The American Academy of Ophthalmology guidelines emphasize that diffuse or focal narrowing of the neuroretinal rim, especially at the superior and/or inferior poles, is a key indicator of glaucomatous damage 2, 3
The CDR asymmetry between eyes is a red flag for glaucomatous optic neuropathy, as optic disc neural rim asymmetry between the two eyes consistent with neural tissue loss is a characteristic finding in POAG 1

The average RNFL thickness of 88μm (right) and 87μm (left) is borderline low, falling in a range where glaucomatous damage must be differentiated from other causes 1
The inferior and temporal region thinning is particularly concerning because inferior and superior RNFL thinning are the most common early manifestations of glaucomatous damage 2, 3, 4
High myopia complicates interpretation because highly myopic individuals without glaucoma may have diffusely thin RNFL, but the focal nature of thinning suggests glaucomatous rather than purely myopic changes 1

Comprehensive baseline evaluation including IOP measurement, gonioscopy to confirm open angles, and visual field testing with standard automated perimetry (SAP) is required 2, 1, 3
IOP measurements should be obtained at multiple time points to assess diurnal variation, as larger inter-eye IOP asymmetry increases glaucoma risk 2, 3, 4

Given the structural findings, monitoring every 3-6 months initially with repeat OCT, visual field testing, and IOP measurements is necessary 2, 5
Treatment decisions depend on the complete risk profile including IOP levels, visual field results, rate of progression, and life expectancy 2, 1
If IOP is elevated or visual field defects are present, treatment to lower IOP by 20-30% from baseline is recommended, as clinical trials demonstrate this reduces risk of developing POAG and slows progression 1

Do not dismiss these findings as purely myopic changes without comprehensive evaluation including IOP and visual fields 1
OCT results outside normative ranges do not always represent disease, but the pattern of focal inferior thinning with asymmetric cupping is highly suspicious for glaucoma 5
Avoid relying solely on summary statistics; the specific patterns of CDR asymmetry and focal RNFL loss are more diagnostically significant 1