Posters

Differences in ocular measurements pre and during Mydriasis using Swept Source OCT and its effect in IOL calculation

Poster Details

First Author: F.Aguilera MEXICO

Co Author(s):    F. Aguilera   R. Gonzalez   A. Zapata Cuevas              

Abstract Details

Purpose:

Detect differences of ocular measurements pre and during Mydriasis using Swept Source - OCT and their effect in IOL Calculations

Setting:

Instituto de Ojos clinic, Mexicali, Mexico APEC Hospital, Mexico City, Mexico

Methods:

45 eyes of patients scheduled for cataract extraction were included SS-OCT Biometry (IOLMaster 700 - Zeiss) measurements were performed Pre and During Mydriasis with Tropicamide 1% ( X3 / 10 min) Statistical Analysis ( GraphPadPRISM.v8) were performed of: KmSteep / KmFlat / Anterior Chamber Depth ACD / Lens Thickness LT / White-White WTW / Axial Length IOLCalculation : SRK-T , HAIGIS , BARRET U2)

Results:

1. There was no statistically significant difference in keratometries and axial length measurements, however there is a a slightly and consistente decrease after pharmacological mydriasis. 2. In the WTW distance there is a mild increase that is not significant. 3. There is a statistically significant difference in the ACD and LT and it will be interesting to increase the sample size to see if this differences prevail. 4.When comparing the oil calculations there was a difference using the Hagis and Barret universal formulas when comparing them in patients with pharmacological mydriasis.

Conclusions:

IOL CALCULATION FORMULAS DEPEND ON PRECISE OCULAR MEASUREMENTS. ALL EYES HAD AN INCREASED ACD AND A DECREASED LT DURING MYDRIASIS. FORMULAS THAT USE ACD AND OR LT IN THEIR ALGORITHMS MAY BE AFFECTED BY CHANGES CAUSED BY PHARMACOLOGICAL MYDRIASIS. ALTHOUGH THESE DIFFERENCES IN MEASUREMENTS WERE STATISTICALLY SIGNIFICANT , THE IOL POWERS WERE NOT CHANGED SUBSTANTIALLY ( 0.2D). CALCULATION OF IOLs CAN BE MADE PRE OR DURING PHARMACOLOGYCAL MYDRIASIS USING SS-OCT FOR OCULAR MEASUREMENTS EVEN IN FORMULAS THAT TAKE ACD AND OR LT INTO THEIR ALGORITHMS

Financial Disclosure:

None