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P. E. Vargas, Sr.; Anterior Chamber and White to White Distance Measurements With Iol Master, Orbscan Ii and Optical Coherente Tomographer in Ametropic Eyes. Invest. Ophthalmol. Vis. Sci. 2010;51(13):4197.
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© ARVO (1962-2015); The Authors (2016-present)
To assess the degree of agreement of anterior chamber depth (ACD) and white to white distance (W-W) measurements taken by three non - contact devices. IOL master, Orbscan and OCT visante and to analyse the relationship between this with spherical equivalent.
A prospective study of phakic eyes in healthy patients in the Department of Cornea and Refractive Surgery at the Fundación Hospital Nuestra Señora de la Luz, IAP, Mexico City was done. ACD and W-W distance was estimated by 3 non contact methods, partial coherence interferometry (IOL master), scanning slit topography (Orbscan II) and partial coherence interferometry (OCT visante). We divided all cases into 4 groups depending on spherical equivalent: Group I ( hyperopic eyes), Group II (low myopia), Group III (moderate myopia) and Group IV (high myopia). Results were analyzed using ANOVA test for each group and was used to correlate the difference between ACD measurements by the 3 methods and Pearson's correlation test.
One hundred phakic eyes of 50 volunteers were included. Spherical equivalent ranged from +0.25 to -8.75 . In Group I (n=29, SE +0.25 to +2.7D), in Group II(n=42,SE-0.1 to -2.9D), in Group III (n=19,SE -3 to -5.9D) and in Group IV(n=10,SE > 6D). In Group I, IOL master had an ACD mean 3.372 SD + 0.34, 0.221 less than Orbscan mean and 0.112 than OCT visante. In Group II, IOL master had a mean of ACD 3.476 SD + 0.23, 0.146 less than OCT and 0.22 mm than Orbscan; In Group III, IOL master had a mean of ACD 3.681 + 0.21, 0.11 less than OCT mean ACD and 0.049 than Orbscan; In Group IV, the ACD mean was 3.627 + 0.22, 0.143 less than OCT and 0.112 less than Orbscan. ANOVA P value in IOL master group <0.001 for ACD, OCT visante P < 0.002 for ACD. Pearson correlated test was statistically significant for IOL master and OCT visante ACD P 0.000.
anterior chamber depht doesn't have a relationship in 3 methods
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