June 2023
Volume 64, Issue 8
Open Access
ARVO Annual Meeting Abstract  |   June 2023
Evaluation of spherical and toric contact lens fitting in eyes with low to moderate astigmatism
Author Affiliations & Notes
  • Alberto Dominguez-Vicent
    Karolinska Institutet, Stockholm, Stockholm, Sweden
  • Mirza Karamovic
    Karolinska Institutet, Stockholm, Stockholm, Sweden
  • Abinaya Priya Venkataraman
    Karolinska Institutet, Stockholm, Stockholm, Sweden
  • Footnotes
    Commercial Relationships   Alberto Dominguez-Vicent Alcon, Code F (Financial Support); Mirza Karamovic Alcon, Code F (Financial Support); Abinaya Priya Venkataraman Alcon, Code F (Financial Support)
  • Footnotes
    Support  None
Investigative Ophthalmology & Visual Science June 2023, Vol.64, OD26. doi:
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      Alberto Dominguez-Vicent, Mirza Karamovic, Abinaya Priya Venkataraman; Evaluation of spherical and toric contact lens fitting in eyes with low to moderate astigmatism. Invest. Ophthalmol. Vis. Sci. 2023;64(8):OD26.

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

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Purpose : Toric contact lenses are still under-prescribed in low to moderate astigmatism due to the perception of complexity in fitting and long time to fit despite having better stabilization technologies. In this prospective study, we evaluated the fitting characteristics, time, and short-term visual outcome in a toric contact lens (TL, PRECISION1 for Astigmatism) compared to the spherical lens (SL, PRECISION1).

Methods : Myopic astigmatic subjects with a cylinder error up to -2.50 D were fitted with both TL and SL in random order in two separate days. The TL had a base curve of 8.5mm and a diameter of 14.5mm, and the SL had a base curve of 8.3mm and a diameter of 14.2mm. The lens fit was assessed after a settling time of 10 minutes for both lenses. For each lens, the fit assessment time, fitting characteristics, and visual acuity with over-refraction were evaluated. For the TL, the lens rotation was objectively assessed from the slit-lamp video recordings. Visual satisfaction was evaluated with the visual analog scale.

Results : A total of 42 myopes astigmatic subjects were evaluated, and 41 subjects who had satisfactory fit with both lenses and were included in the analysis (82 eyes, age: 27.4±6.3 years, 74% female). The mean time for fit assessment of TL was 51±24 seconds longer than the SL (p<0.001). The rotation for the TL was lower or equal than 5 degrees for 90% of the eyes, and 100% of the eyes had a rotation lower or equal than 10 degrees. The visual acuity with the over-refraction was -0.13±0.05 and -0.14±0.05 logMAR with the TL and SL, respectively, and the differences were not significantly different (p=0.122). The Visual Satisfaction score showed that 90% of the subjects preferred the TL compared to the SL.

Conclusions : The chair time to fit toric lens was only about a minute longer than the spherical lens, and had optimal alignment and fit, which was similar to the spherical lens fit. This provides objective evidence that the chair time to fit the PRECISION 1 for astigmatism in low to moderate astigmatic subjects is similar to that of fitting a spherical lens.

This abstract was presented at the 2023 ARVO Annual Meeting, held in New Orleans, LA, April 23-27, 2023.


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