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This abstract is assigned to session AOB Free Papers 2

Presentation type	Oral presentation
Title	Enhancing The Estimation Of Postoperative Intraocular Lens Position Using Optical Coherence Tomography

Purpose	The power of this IOL is preoperatively calculated based on patient’s biometric parameters to achieve the preferred refractive outcome. Different generations of formulas are available to estimate the postoperative effective lens position (ELP), which remains the most important cause of error since it cannot be measured preoperatively. The purpose of this study is to enhance the accuracy of the estimated ELP by utilizing preoperative anterior segment optical coherence tomography (AS-OCT).
Methods	We enrolled patients planned for cataract surgery with the ‘bag-in-the-lens’ technique to undergo a preoperative AS-OCT examination, as well as 5-weeks postoperatively. We included AS-OCT lens parameters in a data analysis, using stepwise multiple linear regression. The results of our regressions were compared with currently used formulas.
Results	A novel estimator of the ELP was found based on ens equatorial position and posterior lens curvature. The regression formulas we propose had a coefficient of determination (r2) of 0.70, 0.68 and 0.64 compared to the postoperative IOL position measured by AS-OCT.
Conclusion	The new estimator of the effective lens position using AS-OCT shows great promise and has potential to enhance the precision of IOL power calculations.
Conflict of interest	No
Details of conflicting interests	No conflict of interest.

Authors 1

Initials	J
Last name	Rens
Department	Universitair Ziekenhuis Antwerpen; Universiteit Antwerpen; ZAS Cadix
City	Antwerpen

Authors 2

Initials	A
Last name	Bonte
Department	Universitair Ziekenhuis Antwerpen; Oogartsenpraktijk Lier
City	Antwerpen, Lier

Authors 3

Initials	L
Last name	Van Os
Department	Universitair Ziekenhuis Antwerpen; AZ Turnhout
City	Antwerpen, Turnhout

Authors 4

Initials	MJ
Last name	Tassignon
Department	Universitair Ziekenhuis Antwerpen; Universiteit Antwerpen; Universitair Ziekenhuis Brussel
City	Antwerpen, Jette

Authors 5

Initials	J
Last name	Rozema
Department	Universitair Ziekenhuis Antwerpen; Universiteit Antwerpen
City	Antwerpen