Corneal power values for use with keratoprostheses and intraocular lenses

2021 ◽  
Author(s):  
Michael J Simpson
Keyword(s):  
Intraocular Lenses ◽  
Corneal Power

Influence of axial length and corneal power on the astigmatic power of toric intraocular lenses

2013 ◽  
Vol 39 (12) ◽  
pp. 1900-1903 ◽  
Author(s):  
Giacomo Savini ◽  
Kenneth J. Hoffer ◽  
Michele Carbonelli ◽  
Pietro Ducoli ◽  
Piero Barboni
Keyword(s):  
Axial Length ◽  
Intraocular Lenses ◽  
Corneal Power

scholarly journals Comparison of Standard and Total Keratometry Astigmatism Measured with three Different Technologies

2020 ◽  
Vol 14 (1) ◽  
pp. 59-65
Author(s):  
Humberto Carreras ◽  
Ángel G. García ◽  
David P Piñero
Keyword(s):  
Crystalline Lens ◽  
Intraocular Lenses ◽  
Corneal Power ◽  
Evaluation Approach ◽  
System P ◽  
Prospective Comparative Study ◽  
Iol Power ◽  
Eye Examination ◽  
Power Measurements ◽  
The Impact

Purpose: To compare the keratometric and total corneal astigmatism measures provided by three different technologies as well as to assess the level of interchangeability among them. Methods: A Prospective, comparative study enrolling 94 eyes from 53 patients (age, 29-77 years) was carried out. All participants were patients with the diagnosis of cataract or patients with a transparent crystalline lens but seeking surgical presbyopia correction. A complete eye examination was performed in all eyes, including corneal analysis with three different devices: IOL-Master 700 (Carl Zeiss Meditec), Cassini (i-Optics), and Pentacam (Oculus Optikgeräte GmbH). Interchangeability of standard and total keratometric readings (equivalent keratometric readings for Pentacam) and astigmatism measures with these three systems were evaluated with the Bland-Altman analysis. Results: Significantly higher standard and total keratometric readings were obtained with the IOL-Master compared to the other two systems (p<0.001). Likewise, a significantly higher magnitude of standard and total keratometric astigmatism was obtained with the Cassini system (p<0.001). Ranges of the agreement for corneal power measurements between devices varied from 0.58 D to 1.53 D, whereas they ranged from 0.46 D to 1.37 D for standard and total astigmatism measurements. Conclusion: Corneal power and astigmatism measures obtained with IOL-Master 700, Cassini, and Pentacam systems cannot be used interchangeably. The impact of these differences on the refractive predictability achieved with different types of intraocular lenses (IOL) should be evaluated in the future in order to define which is the best corneal evaluation approach for optimizing the IOL power calculations.

Sign in / Sign up

Export Citation Format

Share Document