Comparison Of Toric Intraocular Lens Axis Measurement By Photography Versus Slit Lamp
Published 2023 - 41st Congress of the ESCRS
Reference: FP20.06 | Type: Free paper | DOI: 10.82333/d7k1-8049
Authors: Eshchar Raviv Sasportas* 1 , Ehud Assia 2 , Adi Levi 3 , Guy Kleinmann 4
1Ophthalmology,Edith Wolfson Medical Center,Holon,Israel;Sackler Faculty of Medicine,Tel Aviv University,Tel Aviv,Israel, 2Ophthalmology,Ein-Tal Eye Center,Tel Aviv,Israel;Ophthalmology,Meir Medical Center,Kfar Saba,Israel;Sackler Faculty of Medicine,Tel Aviv University,Tel Aviv,Israel, 3Ophthalmology,Ein-Tal Eye Center,Tel Aviv,Israel, 4Ophthalmology,Edith Wolfson Medical Center,Holon,Israel;Ophthalmology,Ein-Tal Eye Center,Tel Aviv,Israel;Sackler Faculty of Medicine,Tel Aviv University,Tel Aviv,Israel
Purpose
To investigate the accuracy of slit lamp measurement of toric Intraocular lens (IOL) axis compared with photography and software measurement of the same IOL.
Setting
Ein Tal eye center, Israel.
Methods
The medical chart of 86 patients (102 eyes) that underwent cataract surgery with toric IOL implantation by 2 experienced surgeons were reviewed retrospectively. Preoperative data include demographics, biometry, and calculated IOL. Post-operative data include visual acuity, refraction, and the IOL axis as measured at the slit lamp and using the Goniotrans eye photograph software. The difference between the two measurements was calculated.
Results
The mean absolute difference between the slit lamp and the photography measurement was 2.13 o±1.9 (range 0-9o). In the against the rule (ATR) cases (n=50) 48% were counterclockwise (CCW) (mean 2.5o±1.5 (range 0.5-7o)), 32% were clockwise (CW) (mean 2.53o±1.9 (range 0.5-7o)) and in 20% there was no difference, average absolute deviation was 0.4o CCW. In the with the rule (WTR) cases (n=40), 52% were CCW (mean 3.14o±2.1 (range 0.5-9o)), 23% were CW (mean 2.89o±1.4 (range 1-5o)) and in 25% there was no difference, average absolute deviation was 1o CCW. In the oblique case (n=12) 58% were CW (mean 2.14o±1.4 (range 0.5-5.5o)), 25% were CCW (mean 3.5o±1.1 (range 2-4.5o) and in 17% there was no deviation, average absolute deviation was 0.37o CW.
Conclusions
A discrepancy between the slit lamp measurement and photography measurement that can be significant was found. When rotation of toric IOL is needed, it is suggested to measure the axis using a photograph and software that measure the IOL axis. Since the difference is not consistent, the slit lamp measurement should be used as is when a photography measurement is unavailable.