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Burak Bilgin**, M.D., Kadir Eltutar*, M.D., N. Demet Ozcelik*, M.D.

INTRAOCULAR LENS POWER CALCULAT I ON BY I MMERS I ON A - SCAN B I OMETRY VERSUS CONTACT A - SCAN B I OMETRY MEASUREMENT S BEFORE CATARACT SURGERY. Burak Bilgin**, M.D., Kadir Eltutar*, M.D., N. Demet Ozcelik*, M.D. . *: Istanbul Education and Research Hospital Opthalmology Department, Turkiye.

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Burak Bilgin**, M.D., Kadir Eltutar*, M.D., N. Demet Ozcelik*, M.D.

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  1. INTRAOCULAR LENS POWER CALCULATION BY IMMERSION A-SCAN BIOMETRY VERSUS CONTACT A-SCAN BIOMETRY MEASUREMENTSBEFORE CATARACT SURGERY Burak Bilgin**, M.D., Kadir Eltutar*, M.D., N. Demet Ozcelik*, M.D. *: Istanbul Education and Research Hospital Opthalmology Department, Turkiye. **: Almangoz Eye Center, Nisantasi, Istanbul, Turkiye. The authors state that they have no proprietary interest and they have not received any grants or funds in support of the study.

  2. PURPOSE : • The study was designed to evaluate the difference in contact A - scan biometry versus immersion A - scan biometry measurementsfor intraocular lens (IOL) power calculationsbefore cataract surgery..

  3. METHODS : • Foldable acrylic hydrophobic IOLs (AcrySof SA60AT, SN60WF, SA30AT, SN60AT) were implanted. • Axial length (AxL) measured by contact A - scan and immersion biometry were compared. • The estimated refraction ( -0,50 Diopters ) was compared with postoperative refraction achieved on the days 1, 7,15 and 30. • Highly myopic eyes with posterior staphyloma were excluded from the study to avoid the miscalculation of IOL power.

  4. RESULTS : • Immersion A-scan measured longer axial length than contact A-scan biometry ( p < 0,05 ).

  5. RESULTS: • Compared to contact A-Scan biometry, estimated refraction measurements with immersion A-Scan biometry were closer to refraction achievedpostoperatively. SE: Spherical Equivalent

  6. Lens power prediction error for the contact A-scangroup was 0,93 ±0,67 D at the visit on day 30, and 0,47 ± 0,46 for the immersion A-scan group respectively. Thedifference wasstatistically significant (p<0,05 ). RESULTS: SE: Spherical Equivalent

  7. CONCLUSIONS: • IOL power calculation to achieve postoperative emmetropia, is an important factor in phacoemulsification surgery. • Our results show that; lens power prediction error with immersion A-Scan biometry is lower compared to contact A-Scan biometry ( p < 0,05 ). • Immersion biometry gives longer axial length measurements compared to contact A-Scan biometry ( p < 0,05 ). • Choosing the appropriate formula for IOL power calculation according to axial length measured by ultrasound biometry plays a major role for achieving emmetropia after uncomplicated phacoemulsification surgery.

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