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Characterization of Angle-Angle Diameter Relationship with Corneal Diameter, Axial Length, and Intraocular Pressure
Taylor Kolosky1, Reshmi Talwar1, He Eun Forbes2
1University of Maryland School of Medicine, Baltimore, Maryland.
Insights
Angle-angle diameter (AA) correlates with corneal diameter and axial length in pediatric glaucoma patients. AA may aid in diagnosing and monitoring pediatric glaucoma, particularly in primary congenital glaucoma.
Area of Science:
- Ophthalmology
- Pediatric Glaucoma Research
- Ocular Biometry
Background:
- Pediatric glaucoma presents unique diagnostic and management challenges.
- Understanding ocular biometric relationships is crucial for effective glaucoma care in children.
Purpose of the Study:
- To investigate the relationship between angle-angle diameter (AA) and intraocular pressure (IOP), corneal diameter (CD), and axial length (AL) in pediatric glaucoma patients.
- To assess the potential clinical utility of AA in pediatric glaucoma.
Main Methods:
- A prospective, cross-sectional observational study involving 19 pediatric glaucoma patients (34 eyes).
- Ultrasound biomicroscopy (UBM) and A-scan biometry were used to measure AA, CD, and AL under general anesthesia.
- Pearson correlation and multivariate regression analyses were performed to evaluate relationships.
Main Results:
- Angle-angle diameter (AA) showed a strong positive correlation with corneal diameter (CD) across most pediatric glaucoma subtypes.
- AA was also strongly correlated with axial length (AL) in primary congenital glaucoma (PCG) and glaucoma following cataract surgery (GFCS).
- No significant correlation was found between intraocular pressure (IOP) and AA or CD; however, in PCG eyes, increased AA was associated with increased AL.
Conclusions:
- Angle-angle diameter (AA) demonstrates strong correlations with corneal diameter and axial length in pediatric glaucoma, suggesting its potential as a clinical tool.
- AA may be valuable for the diagnosis and monitoring of pediatric glaucoma, especially in primary congenital glaucoma.
- Further research with larger cohorts is recommended to elucidate age- and disease-severity-dependent relationships.
Objective:
To characterize the relationship of angle-angle diameter (AA) with intraocular pressure (IOP), corneal diameter (CD), and axial length (AL) in pediatric patients with glaucoma.
Design:
Prospective cross-sectional observational study.
Participants:
Nineteen participants (34 eyes) aged 0.12 to 12.5 years (median = 1.5 years) with pediatric glaucoma.
Methods:
Ultrasound biomicroscopy (UBM), A-scan biometry, and IOP and CD measurement were performed under general anesthesia prior to intraocular surgery. A masked observer measured AA in each UBM image using ImageJ. Pearson analysis and multivariate regression were performed using R.
Main Outcome Measures:
Correlation and age-adjusted regression relationships between AA and CD, AL, and IOP.
Results:
Twenty-three UBM images from 12 primary congenital glaucoma (PCG) participants, 6 from 3 participants with glaucoma following cataract surgery (GFCS), and 5 from 4 participants with Sturge-Weber syndrome-associated glaucoma were analyzed. Angle-angle diameter showed a strong positive correlation with CD (r = 0.93, P < 0.001) across most age groups and glaucoma subtypes except Sturge-Weber syndrome. Angle-angle diameter was also strongly correlated with AL in PCG and GFCS (r = 0.73, P < 0.001; r = 0.87, P = 0.02), with similar associations seen in participants aged <1 year (r = 0.75, P = 0.002). Corneal diameter demonstrated parallel correlations with AL in PCG, GFCS, and infants (r = 0.79, P < 0.001; r = 0.88, P = 0.02; r = 0.78, P < 0.001). No significant correlations were identified between IOP and either AA or CD. In age-adjusted models, AA was not significantly associated with AL or IOP in the overall cohort. However, among PCG eyes, each 1-mm increase in AA corresponded to a significant 1.63-mm increase in AL (P = 0.002). No additional significant associations were observed in other glaucoma subtypes or age groups.
Conclusions:
Angle-angle diameter may be clinically useful for diagnosing and monitoring glaucoma in pediatric patients, as it tends to increase proportionally with AL. Further studies in larger populations will improve understanding of how these relationships change with age and disease severity.
Financial Disclosures:
Proprietary or commercial disclosure may be found in the Footnotes and Disclosures at the end of this article.
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