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ANALYSIS OF CORNEAL ANTEROPOSTERIOR RATIO OF OPTICAL POWER USING OCT.

M Fůs, Š Pitrová

    Ceska a Slovenska Oftalmologie : Casopis Ceske Oftalmologicke Spolecnosti a Slovenske Oftalmologicke Spolecnosti
    |October 11, 2022
    PubMed
    Summary
    This summary is machine-generated.

    The anteroposterior corneal optical power ratio (AP ratio) varies individually, differing significantly from theoretical models. Using an average AP ratio of 1.17 improves total corneal power calculations, enhancing accuracy in eye measurements.

    Keywords:
    corneal AP ratiooptical coherence tomographyoptical cohoerence tomographyposterior corneal radiustotal corneal power

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    Area of Science:

    • Ophthalmology
    • Biomedical Optics
    • Corneal Physiology

    Background:

    • Accurate total corneal power (TCP) estimation is crucial for intraocular lens power calculation.
    • Theoretical eye models often use assumed anteroposterior corneal optical power ratio (AP ratio) values.
    • Individual variations in corneal parameters can impact the accuracy of these assumptions.

    Purpose of the Study:

    • To analyze the anteroposterior corneal optical power ratio (AP ratio) values in a large cohort.
    • To compare individual AP ratio values with established theoretical eye models.
    • To evaluate the impact of using an individual AP ratio on the accuracy of total corneal power approximation.

    Main Methods:

    • Optical Coherence Tomography (OCT) and ocular biometry (Lenstar LS900) were used on 406 eyes.
    • The anteroposterior corneal optical power ratio (AP ratio) was determined for each eye.
    • Pearson correlation coefficient assessed the relationship between AP ratio and ocular biometric parameters. Gaussian equations were used for theoretical total corneal power (TCP) calculations.

    Main Results:

    • The mean AP ratio was 1.17 ±0.02, with most eyes (79.56%) falling between 1.15 and 1.20.
    • Individual TCP values differed significantly from theoretical models (p < 0.05), except for the Liu-Brennan model.
    • The Navarro schematic model yielded the lowest mean difference. Moderate negative correlation was found between AP ratio and corneal posterior curvature (Rp).

    Conclusions:

    • Constant AP ratio assumptions in schematic eye models do not align with measured values.
    • The AP ratio shows a weak negative correlation with limbal diameter (WtW) and a weak positive correlation with central corneal thickness (CCT).
    • Employing the determined average AP ratio (1.17 ±0.02) significantly reduces the discrepancy between calculated and actual total corneal power.