{"id":48640,"date":"2026-06-10T14:52:39","date_gmt":"2026-06-10T05:52:39","guid":{"rendered":"https:\/\/www.huvitz.com\/?p=48640"},"modified":"2026-06-10T18:08:59","modified_gmt":"2026-06-10T09:08:59","slug":"oct-based-rnfl-gcc-indicators-key-interpretation-strategies-for-glaucoma-stages-2","status":"publish","type":"post","link":"https:\/\/www.huvitz.com\/ko\/oct-based-rnfl-gcc-indicators-key-interpretation-strategies-for-glaucoma-stages-2\/","title":{"rendered":"OCT-Based RNFL\u00b7GCC Indicators: Key Interpretation Strategies for Glaucoma Stages Part2"},"content":{"rendered":"
\n\t\t\t\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t\t
\n\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t

\u201cHuvitz publishes this white paper to communicate the clinical value of ophthalmic technologies and to support a better understanding of accurate and consistent diagnosis in clinical practice.\u201d<\/i><\/b><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t
\n\t\t\t
<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t\t
\n\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t

Executive Summary<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t

This white paper presents clinical interpretation strategies for OCT-based structural indicators, including RNFL and GCC, to improve the precision of glaucoma diagnosis and progression assessment.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t

In early-stage glaucoma, interpretation should focus less on the global average thickness and more on localized defects in the superotemporal (ST) and inferotemporal (IT) sectors, as well\nas superior\u2013inferior hemispheric asymmetry patterns.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t

1. Provides an integrated understanding of RNFL and GCC indicators to evaluate\nstructural changes at both the retinal ganglion cell axon and cell body levels.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t

\n2. Interprets glaucoma findings according to disease stage, focusing on localized damage\npatterns rather than average values in early stages, and on longitudinal trends rather than isolated measurements in advanced stages.<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t

3. Presents more accurate clinical interpretation criteria by considering false positives and\ndeviation map artifacts that may occur in highly myopic eyes.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t

\u203b This white paper series consists of three parts. In this first volume, we explore why OCT<\/em>is important in glaucoma diagnosis and the key interpretation principles of RNFL- and <\/em>GCC-based structural analysis.<\/em><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

\n\t\t\t\t\t\t
\n\t\t\t\t\t
\n\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t
\n\t\t\t\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t

In the second volume of this series, we explore how OCT structural parameters should be interpreted in both early and advanced glaucoma. We introduce stage-specific interpretation strategies that focus on localized damage patterns in early disease and longitudinal trend analysis in progressive disease.

\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t

In the first volume, we reviewed the clinical significance of OCT in glaucoma diagnosis and the anatomical structures represented by RNFL and GCC, along with the fundamental principles of interpretation. We highlighted that localized defects, asymmetry, and integrated interpretation of RNFL and GCC are more important than average thickness values alone when assessing structural glaucomatous damage.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t

In clinical practice, however, OCT interpretation strategies should vary according to disease stage. In early glaucoma, identifying subtle structural damage hidden behind normal average values requires careful evaluation of localized defect patterns. In more advanced disease, interpretation should focus on longitudinal trends and rates of change rather than absolute thickness values at a single time point. Furthermore, integrating structural OCT findings with visual field testing plays an important role in understanding disease progression more accurately.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t

This paper explores stage-specific OCT interpretation strategies and discusses how RNFL and GCC can be clinically applied in both early and progressive glaucoma.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

\n\t\t\t\t\t\t
\n\t\t\t\t\t
\n\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t

Early Glaucoma Strategy: Read the Pattern, Not the Average<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\tOne of the most common interpretation errors in early glaucoma is concluding that no abnormality exists simply because the global average RNFL thickness falls within the normal range. Early glaucomatous damage often affects specific nerve fiber bundles rather than the entire RNFL, meaning that average values can mask localized defects.\n\n1<\/span>\nGhita, A. M., et. al., (2023);\n2<\/span>\u00a0 Hood, D. C., et. al., (2022);\n3<\/span>\u00a0 Zhang, X., et. al., (2017).\n<\/span>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t

1. RNFL Interpretation Strategy: Localized Patterns Matter More Than Averages<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t
\n\t\t\t\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t
The following factors should be evaluated when interpreting RNFL:<\/div>
1<\/span>Determine whether statistically significant localized defects are present on deviation maps or probability maps.<\/div>
2<\/span>Perform detailed sectoral analysis, particularly in vulnerable sectors such as the superotemporal (ST) and inferotemporal (IT) regions.<\/div>
3<\/span>Integrate OCT findings with optic nerve head characteristics, including cup-to-disc ratio and disc hemorrhage.<\/div>

The fundamental principle of early glaucoma diagnosis is not to draw conclusions based on average values but to identify structural patterns and relate them to anatomical and clinical findings (Figure 1).<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t
\n\t\t\t
\n\t\t\t\t\t\t\t\t
\"*
* Data obtained using the Huvitz OCT System (OCTavius)<\/figcaption><\/figure><\/div>
\"*
* Data obtained using the Huvitz OCT System (OCTavius)<\/figcaption><\/figure><\/div>\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t
\n\t\t\t\t\t\t<\/path><\/svg>\t\t\t\t\t<\/div>\n\t\t\t\t\t
\n\t\t\t\t\t\t<\/path><\/svg>\t\t\t\t\t<\/div>\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t
<\/div>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t\t
\n\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\tRNFL Defect Patterns and Sectoral Analysis (Quadrant & Clock-Hour) in a Glaucoma Patient\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\nThickness reduction is observed in the inferior and temporal quadrants, with localized RNFL defects concentrated in the inferior clock-hour sectors. The deviation map demonstrates a defect pattern corresponding to the anatomical trajectory of the retinal nerve fiber bundles.\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t

2. Early Detection with GCC: Macular Damage May Appear Before RNFL Changes<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t
\n\t\t\t\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\tThe macula contains the highest density of retinal ganglion cells (RGCs). In some cases of early glaucoma, macular GCC thinning may be detected even when peripapillary RNFL thickness remains within the normal range. In particular, the superotemporal and inferotemporal GCC regions correspond anatomically to superior visual field defects and reflect early damage within the macular vulnerability zone.\n\n1<\/span>\nGhita, A. M., et. al., (2023); \n2<\/span>\u00a0 Hood, D. C., et. al., (2022);\n3<\/span>\u00a0 Zhang, X., et. al., (2017);\n4<\/span> Alluwimi, M. S., et. al., (2023).\n<\/span>\n\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t
The following factors should be evaluated during GCC interpretation:<\/div>
1<\/span>
Clustered localized abnormalities on deviation\/probability maps<\/div>
Rather than focusing on isolated abnormal points, evaluate whether statistically significant color-coded clusters are present across adjacent regions.<\/div>
2<\/span>
Superior\u2013inferior GCC asymmetry<\/div>
Assess whether superior\u2013inferior GCC thickness differences are abnormally increased or whether probability map abnormalities are concentrated within one hemifield.<\/div>
3<\/span>
Central and parafoveal damage patterns<\/div>
Because such damage may not be adequately represented on standard 24-2 visual field testing, supplementary 10-2 or 24-2C testing should be considered.<\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t\t
\n\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t

Executive Summary<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t

This white paper presents clinical interpretation strategies for OCT-based structural
indicators, including RNFL and GCC, to improve the precision of glaucoma diagnosis and
progression assessment.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t

In early-stage glaucoma, interpretation should focus less on the global average thickness and more on localized defects in the superotemporal (ST) and inferotemporal (IT) sectors, as well
as superior\u2013inferior hemispheric asymmetry patterns.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t1. Provides an integrated understanding of RNFL and GCC indicators to evaluate\nstructural changes at both the retinal ganglion cell axon and cell body levels.\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\n2. Interprets glaucoma findings according to disease stage, focusing on localized damage\npatterns rather than average values in early stages, and on longitudinal trends rather than isolated measurements in advanced stages.<\/strong>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t

3. Presents more accurate clinical interpretation criteria by considering false positives and
deviation map artifacts that may occur in highly myopic eyes.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t

3. Progressive Glaucoma Strategy: Track the Rate of Change, Not Just Thickness<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t
\n\t\t\t\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\tGCC (Figure 2) is an indicator reflecting the macular region, where retinal ganglion cell bodies are densely concentrated, and provides complementary information to RNFL, which evaluates\nretinal ganglion cell axons. Because the macula contains a high density of retinal ganglion\ncells, structural damage may be detected relatively early, even in some cases of early glaucoma or before visual field defects become clinically apparent.\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t
\n\t\t\t
\n\t\t\t\t\t\t\t\t
\"*
* Data obtained using the Huvitz OCT System (OCTavius)<\/figcaption><\/figure><\/div>
\"*
* Data obtained using the Huvitz OCT System (OCTavius)<\/figcaption><\/figure><\/div>\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t
\n\t\t\t\t\t\t<\/path><\/svg>\t\t\t\t\t<\/div>\n\t\t\t\t\t
\n\t\t\t\t\t\t<\/path><\/svg>\t\t\t\t\t<\/div>\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t
<\/div>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t\t
\n\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut elit tellus, luctus nec ullamcorper mattis, pulvinar dapibus leo.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut elit tellus, luctus nec ullamcorper mattis, pulvinar dapibus leo.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t3-1. RNFL Floor Effect: The Risk of Missing Progression by Relying on Thickness Alone\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t
\n\t\t\t\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\tAs glaucoma progresses, RNFL measurements eventually approach a measurement floor. Once average RNFL thickness decreases to approximately 70\u201375 \u03bcm, additional neural loss may continue while measurable thickness changes become increasingly limited. Beyond this structure\u2013function tipping point, relying solely on RNFL measurements may underestimate ongoing disease activity.\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t3-2. GCC Trend Analysis: A Key Tool for Monitoring Advanced Glaucoma\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t
\n\t\t\t\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\tGCC reflects retinal ganglion cell bodies within the macula and maintains a wider dynamic range than RNFL. Consequently, GCC often preserves structure\u2013function correspondence even in advanced disease stages where RNFL measurements have approached the floor effect. Therefore, both RNFL and GCC trends should be reviewed simultaneously; however, when RNFL thickness approaches its measurement floor, greater emphasis should be placed on GCC-based interpretation. Annual GCC slope analysis is particularly important, and acceleration in the rate of GCC loss should be regarded as a significant indicator of disease progression.\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t3-3. Principles of Structure\u2013Function Integration\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t
\n\t\t\t\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\tIn advanced glaucoma, functional progression assessment should be based on integrated interpretation of structural and functional findings. Structure\u2013function relationships should always be evaluated within anatomically corresponding sectors.\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t\t
\n\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\tExplore Huvitz Solutions for Glaucoma Diagnosis\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t\t
\n\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t\t
\n\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t
\n\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\tOCTavius<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t
\n\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t
\n\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\uc138\uadf9\ub4f1 \ud604\ubbf8\uacbd \uc2dc\uc2a4\ud15c<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t\t
\n\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t
OCTavius<\/i><\/a><\/div><\/div><\/div><\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t
\n\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t
\uc138\uadf9\ub4f1 \ud604\ubbf8\uacbd \uc2dc\uc2a4\ud15c<\/i><\/a><\/div><\/div><\/div><\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t

Key Terminology<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t
\n\t\t\t\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\n \n \n \n \n \n \n \n \n
Term<\/th>\n Definition<\/th>\n <\/tr>\n <\/thead>\n
\n RNFL (Retinal Nerve Fiber Layer)\n <\/td>\n \n A layer composed of retinal ganglion cell axons surrounding the optic disc, serving as a primary structural indicator for evaluating glaucomatous damage.\n <\/td>\n <\/tr>\n
\n GCC (Ganglion Cell Complex)\n <\/td>\n \n A structural indicator reflecting the macular region where retinal ganglion cell bodies are densely concentrated, used to evaluate glaucomatous damage.\n <\/td>\n <\/tr>\n
\n Deviation Map\n <\/td>\n \n A map that displays statistically significant deviations by comparing patient data with a normative database, commonly used to assess localized defect patterns.\n <\/td>\n <\/tr>\n
\n Floor Effect\n <\/td>\n \n A measurement limitation in which additional neural loss is not adequately reflected once RNFL thickness decreases below a certain threshold.\n <\/td>\n <\/tr>\n
\n False Positive\n <\/td>\n \n A case in which test results are interpreted as abnormal despite the absence of actual pathological damage.\n <\/td>\n <\/tr>\n <\/tbody>\n<\/table>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t\t
\n\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t

FAQ<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t
\n\t\t\t\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t\t
\n\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t
\n\t\t\t\t\t\t\t
\n\t\t\t\t\t

\n\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t<\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\tQ1. Can glaucoma still be suspected even if the average RNFL thickness is within the normal range?<\/a>\n\t\t\t\t\t<\/h3>\n\t\t\t\t\t

A. Yes. In early glaucoma, localized RNFL thinning often appears first in the superotemporal or inferotemporal sectors, even when the global average RNFL thickness remains within the normal range. Therefore, it is important to evaluate localized defect patterns on the deviation map rather than relying solely on average thickness values.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t

\n\t\t\t\t\t

\n\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t<\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\tQ2. Which OCT indicator should be prioritized, RNFL or GCC?<\/a>\n\t\t\t\t\t<\/h3>\n\t\t\t\t\t

A. Because RNFL and GCC reflect different anatomical information, the most appropriate approach is to interpret both indicators together. RNFL evaluates retinal nerve fiber axons surrounding the optic disc, whereas GCC assesses the retinal ganglion cell bodies within the macular region. Integrated analysis of both parameters provides a more comprehensive understanding of glaucomatous structural damage.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t

\n\t\t\t\t\t

\n\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t<\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\tQ3. Why should OCT and visual field testing be interpreted together?<\/a>\n\t\t\t\t\t<\/h3>\n\t\t\t\t\t

A. In glaucoma, structural and functional changes do not always appear at the same time. In some patients, OCT-based structural abnormalities may precede functional loss, while in others, functional changes on visual field testing may become apparent earlier. Therefore, a structure\u2013function integrated approach combining OCT structural analysis and visual field testing is essential for more accurate diagnosis and progression assessment.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t