Optical biometry results in silicon filled eyes

Session Details

Session Title: Presented Poster Session: Equipment, Instrumentation & Surgical Devices

Venue: Poster Village: Pod 1

First Author: : E.Kokareva RUSSIA

Co Author(s): :    A. Kulikov   A. Kuznetzov                    

Abstract Details

Purpose:

To compare the results of "IOLMaster" and "Lenstar LS 900" biometry in silicone filled eyes and after its removal

Setting:

Ophthalmology Department of S.M.Kirov Military Medical Academy of Ministry of defense, Saint-Petersburg

Methods:

Study included 27 patients (27 eyes) aged from 20 to 84 years, who had silicone oil endotamponade after macular hole or complicated retinal detachment surgery. Cases with elements of sclera buckling were excluded. All of the patients with endotamponade underwent "IOLMaster" and "Lenstar LS 900" biometry in special mode. These results were compared with the axial length (AL) values after silicone oil removal. It ranged from 21,99 mm to 29,38 mm (24,36±1,74 mm) according to the "IOLMaster" data and from 21,96 mm to 29,41 mm (24,44±1,78 mm) according to "Lenstar LS 900" measurements.

Results:

Vitreous cavity lenght varied from 67,10% to 80,23% (73,37±4,70%) of AL value and have no significant correlation with it. Patients were divided into 2 groups: I - AL≤24,0 mm (n=13), II group - AL>24,0 mm (n=14). In the I group there were no reliable differences in AL before and after silicone oil removal: -0,08±0,25mm according to "IOLMaster" (p=0,422) and -0,06±0,23mm - to "Lenstar LS 900" (p=0,625). In the II group differences were significant: 0,30±0,49mm (p=0,043) and 0,25±0,48mm (p=0,019) correspondingly. In group II measurement divergences were significantly higher than in I group for both methods (p<0,05).

Conclusions:

"IOLMaster" and "Lenstar LS 900" biometry in silicone filled eyes with AL>24,0 mm gives overestimated values and leads to significant error in IOL calculation with myopic shift of postoperative refraction in case of combination phacoemulsification with silicon oil removal despite application of special investigation mode. For eyes with AL≤24,0 mm biometry error is not significant and does not make a difference in IOL calculation. Both biometry methods have equal accuracy in AL evaluation in eyes with silicon endotamponade.

Financial Disclosure:

None