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This abstract is assigned to session AOB and FRO E-Posters

Title	The role of vitreous body on the effective IOL position
Abstract Nr.	3005

Purpose	To compare the effective lens position (ELP) after phaco surgery only and after combined phacovitrectomy surgery (phacoVTX).
Methods	Pre- and post- operative biometric measurements were performed using laser interference biometry. The postoperative anterior chamber depth (ACD) was measured to determine ELP. The primary outcome was the difference in postoperative ACD comparing both eyes.
Results	Twenty patients who were scheduled for elective surgery in both eyes were included. In one eye, phacoVTX surgery was performed (without any tamponade), in the fellow eye only phaco surgery was performed using the same IOL type. Both the ACD post-op and the change in ACD are significantly different (p<0,05) between the two groups, with the phacoVTX group having a deeper ACD and higher change in ACD compared to the phaco group. No statistically significant difference was found regarding the average postoperative axial length (AL) or spherical equivalent (SE) between the two groups.
Conclusion	Postoperative ACD is increased when phacoVTX is compared to phaco surgery only, indicating a more posterior positioning of the IOL. An adjusted ELP parameter may be useful in eyes ondergoing combined phacoVTX to optimize IOL calculation.
Conflict of interest	No

Authors 1

Last name	VANDER MIJNSBRUGGE
Initials	J
Department	UZ Leuven - campus Sint Raphaël
City	Leuven

Authors 2

Last name	Fils
Initials	JF
Department	Ars Statistica
City	Nivelles

Authors 3

Last name	Jansen
Initials	J
Department	UZ Leuven - campus Sint Raphaël
City	Leuven

Authors 4

Last name	Hua
Initials	MT
Department	UZ Leuven - campus Sint Raphaël
City	Leuven

Authors 5

Last name	Stalmans
Initials	P
Department	UZ Leuven - campus Sint Raphaël
City	Leuven