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Lenticular astigmatism in tilted disc syndrome
Abuzer Gündüz1, Cem Evereklioglu, Hamdi Er
1Department of Ophthalmology, Inönü University Medical Faculty, Turgut Ozal Medical Center, Research Hospital, Malatya, Turkey.
Journal of Cataract and Refractive Surgery
|October 22, 2002
Summary
Tilted disc syndrome (TDS) is linked to significant lenticular astigmatism, an abnormal lens shape. This finding is crucial for refractive surgery planning and requires careful evaluation of both corneal and lenticular astigmatism in patients with abnormal optic discs.
Area of Science:
- Ophthalmology
- Optometry
- Vision Science
Background:
- Tilted disc syndrome (TDS) is characterized by an abnormal optic disc shape.
- The relationship between optic disc morphology and ocular refractive components, particularly lenticular astigmatism, remains incompletely understood.
- Assessing lenticular astigmatism is vital for accurate refractive error correction.
Purpose of the Study:
- To investigate the association between abnormal optic disc shape in patients with TDS and the configuration of the crystalline lens.
- To determine if lenticular astigmatism is more prevalent or pronounced in individuals with TDS compared to healthy controls.
- To evaluate the clinical significance of lenticular astigmatism in TDS patients.
Main Methods:
- A cross-sectional, masked case-control study involving 32 patients with TDS and 20 healthy controls.
- Morphometric analysis of optic disc photographs and calculation of lenticular astigmatism via vector analysis.
- Statistical comparison using the Mann-Whitney U test, with a significance level of P < 0.05.
Main Results:
- Patients with TDS exhibited significantly higher mean lenticular astigmatism (-1.31 +/- 0.98 D) compared to controls (-0.20 +/- 0.35 D) (P <.001).
- A high prevalence of clinically significant lenticular astigmatism was observed in TDS patients (90.6% had some lenticular astigmatism, 50% > -1.00 D).
- Mean keratometry was also significantly higher in TDS patients (43.84 +/- 1.06 D) versus controls (42.75 +/- 1.45 D) (P =.011).
Conclusions:
- Clinically significant lenticular astigmatism is a common finding in patients with tilted disc syndrome.
- Ophthalmoscopy revealing an abnormal optic disc shape warrants careful evaluation of both corneal and lenticular astigmatism.
- Accurate assessment of lenticular astigmatism is essential to optimize refractive outcomes, particularly in patients considering refractive surgery.