OCT reveals regional differences in macular thickness with age

Area of Science:

• Ophthalmology
• Medical Imaging
• Gerontology

Background:

• Age-related changes in retinal thickness are crucial for understanding ocular health.
• Optical coherence tomography (OCT) is a key imaging modality for assessing retinal structure.
• Accurate spatial localization is essential for identifying subtle age-related retinal thinning.

Purpose of the Study:

• To identify age-related retinal thickness changes in healthy eyes using advanced optical coherence tomography (OCT) techniques.
• To improve spatial localization for detecting macular thickness abnormalities.
• To establish normative data for retinal thickness variations with age.

Main Methods:

• Measured retinal thickness in 30 healthy subjects (ages 13-69) using Stratus OCT 3.
• Acquired 12 radial scans centered at the foveola, interpolating to create a topographic map.
• Analyzed retinal thickness in 37 hexagonal regions and evaluated age-related changes, including retinal nerve fiber layer (RNFL) contribution.

Main Results:

• Overall macular thinning of 2.7 µm/decade was observed with increasing age (p=0.027).
• Significant thinning occurred in the nasal region (4.1 µm/decade, p<0.002), unlike other regions.
• Retinal nerve fiber layer (RNFL) loss accounted for approximately 43% of the nasal retinal thinning.

Conclusions:

• The employed OCT method enhances spatial localization for detecting age-related retinal changes.
• The macula thins non-uniformly with age, with the most significant thinning occurring nasal to the fovea.
• RNFL loss is a major contributor, but not the sole cause, of age-related nasal macular thinning.