Posters

Comparative analysis of axial length and anterior chamber depth measurement between applanation, immersion and swept-source optical biometry

Poster Details

First Author: H.Rashid BANGLADESH

Co Author(s):                        

Abstract Details

Purpose:

Precise biometry is one of the major key factors for obtaining desired refractive outcome after cataract surgery. Visual outcome strongly depend on accuracy of ocular parameters especially axial length (AL) and anterior chamber depth (ACD). It is very important to evaluate different biometry methods to have accurate ocular measurements for effective IOL power calculation. The aim of the study is to compare and analyze the measurement of axial length (AL) and anterior chamber depth (ACD) using applanation, immersion and swept source optical biometry.

Setting:

All the tests have been done in investigation unit of a tertiary eye hospital by a single observer. Written consent has been collected from the enrolled patients under study.

Methods:

A prospective study conducted on 168 patients enrolled for cataract surgery. 280 eyes have been tested by a single observer. Axial length (AL) and anterior chamber depth (ACD) was measured consecutively by optical, applanation and immersion biometry. The results have been statistically evaluated to establish efficacy and correlation among the three methods of biometry.

Results:

The mean of axial length from swept source optical biometry is 23.68 ±1.68 mm, which is 0.1mm (p=0.770) less by applanation biometry and 0.02 mm (p=0.557) less by immersion biometry. For anterior chamber depth, the mean value from swept source optical biometry is 3.27 ±0.42 mm. This value is highest in compare to both applanation (0.12 mm less with p= 0.622) and immersion (0.14 mm less with p= 0.959) biometry. Further analysis reveals strong correlation of swept source optical biometry with applanation (r=0.985 for AL and 0.953 for ACD) and immersion (r= 0.965 for AL and 0.985 for ACD) biometry.

Conclusions:

The study reveals that among optical, applanation and immersion method the swept source optical biometry method appeared to be the most précised way of measuring axial length (AL) and anterior chamber depth (ACD) of eye. The study also shows an excellent agreement and strong positive correlation of swept source optical biometry with applanation and immersion biometry.

Financial Disclosure:

None