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Analysis of crystalline lens position
Chao-Yu Hu1, Jeen-Hon Jian, Yung-Piao Cheng
1Department of Ophthalmology, Far Eastern Memorial Hospital, Taipei Municipal Yang-Ming Hospital, Taipei, Taiwan. cyhu@med-assn.org.tw
Journal of Cataract and Refractive Surgery
|May 16, 2006
Summary
This study establishes normal crystalline lens position, revealing slight decentration and tilt. Lens position showed limited impact on refractive error, providing a baseline for future intraocular lens shift research.
Area of Science:
- Ophthalmology
- Optometry
- Biomedical Optics
Background:
- Accurate crystalline lens position data is crucial for understanding ocular biomechanics.
- Establishing a normative baseline is essential for detecting pathological shifts or evaluating intraocular lens (IOL) stability.
Purpose of the Study:
- To determine the normal crystalline lens position in a healthy population.
- To provide a comparative baseline for future research on crystalline lens or intraocular lens shift.
Main Methods:
- A prospective study utilizing a Scheimpflug anterior segment analyzer (EAS-1000, Nidek).
- Measurements included anterior chamber depth (ACD), lens decentration, and lens tilt in subjects without prior ocular surgery or major ocular diseases.
- Refractive error was assessed, and statistical analyses (multiple linear regression, Pearson correlation) were employed to explore age-related effects and relationships.
Main Results:
- Thirty-nine eyes from 30 healthy subjects (age range 4-53 years) were analyzed.
- The crystalline lens exhibited a mean decentration of 0.25 mm superotemporally and a tilt of 2.85 degrees.
- Anterior chamber depth (ACD) varied with age, increasing before 20 years and decreasing thereafter, while lens tilt decreased with age. Lens position did not significantly influence refractive error.
Conclusions:
- The crystalline lens is typically not perfectly aligned with the visual axis.
- The observed lens position and tilt have a limited effect on refractive outcomes such as spherical equivalent and astigmatism.