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Real-time intraocular pressure during femtosecond laser cataract surgery using a liquid optics interface system in donor human eyes

Poster Details

First Author: M.Ibarz SPAIN

Co Author(s):    P. Tañá   G. Bolívar   J. Rodríguez-Prats        

Abstract Details


To investigate the changes in intraocular pressure (IOP) during femtosecond laser cataract surgery using al liquid optics interface system in donor human eyes.


Oftalvist Hospital Moncloa


Six enucleated human eyes were treated with a liquid optics interface femtosecond platform for cataract surgery. Various drops of tropicamide 0.5%, phenylephrine 2.5% and cyclopentolate 1% were instilled immediately after the enucleation and never after the first four hours after the time of death. IOP was measured with a reusable blood pressure transducer connected by direct cannulation to the anterior chamber, recording data before suction (basal IOP), at the beginning of the suction phase, every five seconds during femtosecond procedure, and after the removal of the suction ring from the eye.


Capsulorhexis and lens fragmentation were completed only in 2 of the 6 eyes. In contrast, intraocular pressure could be successfully measured over the whole procedure in all the eyes. The total femtosecond procedure time was 90.83 + 20.83 seconds with a range of 60-115 seconds. Basal IOP was 9.16 + 5.30 mmHg and increased to 39.66 + 13.50 mmHg after suction (p value <0.001). IOP remained stable during femtosecond procedure (p value = 0.976; RM-ANOVA). IOP immediately before the removal of the suction ring was 33.55 + 14.54 mmHg. IOP after removal of the suction ring was lower than basal IOP values with no statistical differences (p value = 0.097).


Real-time IOP can be measured during femtosecond laser assisted cataract surgery using a transducer connected to the anterior chamber in human donor eyes. Even though it is possible to asses a moderate rise in intraocular pressure during the procedure, the lack of transparency of the cornea, the difficulties to achieve pupil dilation and the very low levels of intraocular pressure of human donor enucleated eyes makes surgery almost impossible to be performed. FINANCIAL INTEREST: NONE

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