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Power vector analysis of the optical outcome in patients with phacoemulsification + iStent vs phacoemulsification alone

Poster Details

First Author: K.Schargel SPAIN

Co Author(s):    M. Garcia   J. Campello   J. Placeres   J. Ruiz   J. Belda   E. Lozano

Abstract Details


Using a power vector method of representing and analyzing spherocylindrical refractive errors see if there are differences in patients with a standard Cataract surgery plus IOL implantation and iStent compare with standard Cataract surgery plus IOL implantation alone


Hospital de Torrevieja, Alicante. Spain


We include 23 patients with standard Cataract surgery plus IOL implantation and iStent (Group A) and 30 Cataract surgery plus IOL implantation alone (Group B), The Refractive errors were expressed as power vectors. The 3 Cartesian coordinates (x,y,z) of each power vector correspond to the power of 3 lenses that in combination describe: power M spherical lens power, J0 cross cylinder axes 90 or 180 degrees and a cross cylinder J45 at 45 or 135 degrees. The power vector B represents the overall blurring strength, thus end point of the study. We also compare other variables, such as IOP outcome at 1 month


mean age of the 53 patients was 72,13 ±8,57 with a range 47 to 86. No differences were found between the groups, with Preop visual acuity Group A 0,45 ±0,18 and Group B 0,36 ±0,18, Blurring effect Preop Group A 2,76 ḟ2,40 Group B 2,19 ±1,77.Postop Group A visual acuity 0,84 ±0.19 Group B 0,88 ±0.16 and Blurring effect Group A 0,86 ±0.5 Group B 0.85 ±0.55 Distribution by sex male 34,9 % and female 58,1%. Right eye 55,0 % and Left eyes 45,0 %. IOP Preop Group A 23 mm Hg; Group B 18 mm Hg and Post Op Group A 15 mm Hg and Group B 16 mm Hg


There is no difference in overall blurring strength between the groups. There is a significant difference in IOP reduction between the groups as it was expected, the cataract patient groups were patients without Glaucoma and it is well know that the surgery itself decrease the IOP but the use of the iStent in patients with cataract and glaucoma lowers the IOP to a higher degree

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