April 2010
Volume 51, Issue 13
ARVO Annual Meeting Abstract  |   April 2010
Toric IOL Implant: Limoli Caliper versus Mendez Ring
Author Affiliations & Notes
  • P. G. Limoli
    Centro Studi Ipovisione, Milan, Italy
  • R. Carpi
    Centro Studi Ipovisione, Milan, Italy
  • L. M. D'Amato
    Centro Studi Ipovisione, Milan, Italy
  • E. Giacomotti
    Centro Studi Ipovisione, Milan, Italy
  • F. Tassi
    Centro Studi Ipovisione, Milan, Italy
  • Footnotes
    Commercial Relationships  P.G. Limoli, None; R. Carpi, None; L.M. D'Amato, None; E. Giacomotti, None; F. Tassi, None.
  • Footnotes
    Support  None.
Investigative Ophthalmology & Visual Science April 2010, Vol.51, 4578. doi:
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    • Get Citation

      P. G. Limoli, R. Carpi, L. M. D'Amato, E. Giacomotti, F. Tassi; Toric IOL Implant: Limoli Caliper versus Mendez Ring. Invest. Ophthalmol. Vis. Sci. 2010;51(13):4578.

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      © ARVO (1962-2015); The Authors (2016-present)

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The Toric IOL represents the biggest innovation in the cataract surgery in the last years. The quality achieved in the correction of astigmatism inside the eye, couldn’t be achieve in other way.There are three milestones in the implant of a Toric IOL:A) The exact measurement of the size and of the axis of astigmatism corneal.B) The exact marking of this axis on the eyeball at the beginning of the surgery.C) The implant of the IOL with the axis of the lens ugual to the axis marked on the eyeball.However the marking techniques are still coarse and complex.With the caliper goniometric, the insert is easily, quickly and precisely.The caliper allows in the same moment either the measurement of the insertion angle than the marking.Compared to the Mendez ring, the caliper goniometric gives accuracy of 5° respect the 10 ° of the other tool; besides, the using of the Mendez ring requires during the practice the utilization of a second instrument.


We analyzed 36 eyes treated with AcrySoft® Toric IOL, divided in two groups.In the group A we used the Mendez ring in order to mark the insertion angle of the IOL, in the group B we used the caliper goniometric of Limoli.The choice of the implant was provided from the software Alcon found on: www.acrysoftoriccalculator.comThe marking is done on the limbus along the axis 180°-0° with the patient seated. Then a topographic analysis allowed to value the magnitude of the mistake on the marking, if there are.The Mendez ring has been limited to the limbus and the axis has been identified with a marker in a second moment.The Limoli goniometric caliper, opened with the needed degrees, and pointed with one of his tips on the first marking along the axis 180° to 0°, permitted the identification of the axis and the marking at the same time. The possible errors in the first marking had been valuated and included in the opening of the caliper.


From each groups we considered the preoperative corneal astigmatism and, after 2 weeks from the surgical, we considered also the refractive.The rate of reduction of the astigmatism is been in the group A of 69,17% and in the group B of 89,44%.


The caliper goniometric responds to the precision criteria requested and makes more simple the marking.  

Keywords: cataract • astigmatism • treatment outcomes of cataract surgery 

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