Possible association between long anterior lens zonules and plateau iris configuration
ABSTRACT To report plateau iris configuration (PIC) in subjects who have the long anterior zonule (LAZ) clinical trait.
Two elderly African American males who exhibited LAZ and had partial appositional angle closure persisting after laser iridotomy were imaged with high-resolution ultrasonography to examine for PIC. A third elderly LAZ subject who had narrow angles without closure was also imaged for PIC. Each subject was tested for a serine 163 arginine mutation (S163R) C1q tumor necrosis factor-related protein 5 gene (C1QTNF5/CTRP5) mutation, which may be associated with the LAZ phenotype.
All 3 LAZ subjects also had PIC, an unlikely association due to chance alone. None carried the S163R CTRP5 mutation.
LAZ and PIC may have association and require study because LAZ might be a useful indicator for an increased likelihood of PIC and risk of angle closure. Mutation other than CTRP5 S163R should also be considered for the LAZ trait, which could be an important phenotypic marker in genetic studies.
- SourceAvailable from: InTech
Chapter: Plateau IrisGlaucoma - Basic and Clinical Concepts, 11/2011; , ISBN: 978-953-307-591-4
- [Show abstract] [Hide abstract]
ABSTRACT: Purpose: To investigate presence of remnants of the tunica vasculosa lentis, a possible indication of anterior segment dysgenesis, in subjects with the long anterior zonule (LAZ) trait. Methods: Retroillumination photographs of the pupil region had been collected in earlier study of the LAZ trait in African Americans. Secondary image analysis was performed to assess the frequency of intact persistent pupillary membrane iris strands (PPMIS). Results: The analysis included 148 subjects, comprised of 74 LAZ subjects (median age=70 y; range, 50 to 91 y; 64 females) and 74 controls (68 y; 50 to 83 y; 64 females). While controlling for age and sex, analysis showed that LAZ subjects were 3.1 times more likely than controls (odds ratio=3.1; 95% confidence interval, 1.4-6.7; P=0.004) to exhibit PPMIS in at least one of their eyes. Conclusion: The LAZ trait, which is being studied as a potential risk factor for glaucoma, was associated with presence of PPMIS in our study population.Journal of glaucoma 05/2013; 23(7). DOI:10.1097/IJG.0b013e3182946522 · 2.11 Impact Factor
- [Show abstract] [Hide abstract]
ABSTRACT: Purpose: To investigate ocular dimensions in African Americans with the long anterior zonule (LAZ) trait. Methods: A total of 61 African American LAZ subjects and 61 age-matched, race-matched, and sex-matched controls were compared with respect to central corneal thickness, central corneal curvature, axial length (AL), and subjective refraction. Results: LAZ right eyes had a mean SR=+1.75±1.82 D and were 1.58 D (95% confidence interval, 0.83-2.31 D, P<0.0001) more hyperopic on average when compared with the control right eyes. LAZ right eyes also had an AL that was 0.69 mm (95% confidence interval, 0.34-1.04 mm, P<0.001) shorter on average than control right eyes. Similar results were found for left eyes. No differences were found with respect to central corneal curvature and central corneal thickness (P>0.05). Conclusions: In this data set, LAZ eyes tended to be more hyperopic and had ALs that were shorter than control eyes, characteristics that are consistent with elevated risk for angle-closure glaucoma.Journal of glaucoma 06/2013; 22(5):393-397. DOI:10.1097/IJG.0b013e3182447d6c · 2.11 Impact Factor