Structure-Function Relationship in Patients with Retinitis Pigmentosa and Hyperautofluorescent Rings

Area of Science:

• Ophthalmology
• Retinal Imaging
• Vision Science

Background:

• Retinitis pigmentosa (RP) is a group of inherited retinal diseases.
• Hyperautofluorescent (hyperAF) rings are a characteristic finding in some RP patients.
• Understanding the relationship between retinal structure and function is crucial for RP management.

Purpose of the Study:

• To investigate the association between retinal sensitivity and retinal microstructures.
• To analyze fundus autofluorescence (FAF) and optical coherence tomography (OCT) findings in RP patients with hyperAF rings.

Main Methods:

• Cross-sectional study of 44 eyes from 26 RP patients.
• Evaluation of hyperAF ring morphology (area, diameter) using FAF.
• Assessment of retinal microstructure (total retinal thickness - TRT, outer retinal thickness - ORT) using OCT.

Main Results:

• Strong correlation found between mean retinal sensitivity and hyperAF ring area (R=0.8013) and longest diameter (R=0.9072).
• Outer retinal thickness (ORT) showed a stronger correlation with retinal sensitivity (R=0.6551) than total retinal thickness (TRT) (R=0.2732).
• Segmented linear regression identified critical breakpoints for hyperAF ring size and ORT in relation to retinal sensitivity.

Conclusions:

• Retinal sensitivity in RP patients with hyperAF rings is significantly associated with the morphological geometry of the hyperAF ring.
• Outer retinal thickness is a more sensitive indicator of visual function than total retinal thickness in this patient group.