A Comparison between Automated Subjective Refraction and Traditional Subjective Refraction in Keratoconus Patients

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Carracedo Rodríguez, Juan Gonzalo and Carpena Torres, Carlos and Pastrana, Cristina and Privado Aroco, Ana and Serramito Blanco, María and Espinosa Vidal, Teresa M. and Rodríguez Lafora, María (2021) A Comparison between Automated Subjective Refraction and Traditional Subjective Refraction in Keratoconus Patients. Optometry and Vision Science, 98 (6). pp. 597-604. ISSN 1040-5488

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Official URL: https://dx.doi.org/10.1097/OPX.0000000000001710




Abstract

SIGNIFICANCE: The performance of the Eye Refract (Luneau Technology, Chartres, France), a new instrument to perform aberrometry-based automated subjective refraction, has been previously evaluated in healthy subjects. However, its clinical implications in other ocular conditions are still unknown.
PURPOSE: The purpose of this study was to evaluate the agreement between the Eye Refract and the traditional subjective refraction, as the criterion standard, in keratoconus patients with and without intracorneal ring segments (ICRSs).
METHODS: A total of 50 eyes of 50 keratoconus patients were evaluated, dividing the sample into 2 groups: 27 eyes without ICRS (37.78 ± 9.35 years) and 23 eyes with ICRS (39.26 ± 13.62 years). An optometrist conducted the refraction with the Eye Refract, and another different optometrist conducted the traditional subjective refraction on the same day. Spherical equivalent (M), cylindrical vectors (J0 and J45), and corrected distance visual acuity were compared between both methods of refraction. In addition, Bland-Altman analysis was performed to assess the agreement between both methods of refraction.
RESULTS: There were no statistically significant differences (P ≥ .05) between the Eye Refract and the traditional subjective refraction for all the variables under study in either group. Without ICRS, the mean difference and 95% limits of agreement (upper, lower) were −0.20 (+1.50, −1.89) D for M, −0.14 (+1.40, −1.68) D for J0, and +0.05 (+1.23, −1.14) D for J45. With ICRS, these values worsened to −0.62 (+3.89, −5.12) D for M, +0.06 (+2.46, −2.34) D for J0, and −0.02 (+2.23, −2.28) D for J45.
CONCLUSIONS: The Eye Refract seems to offer similar results compared with the traditional subjective refraction in keratoconus patients not implanted with ICRS. However, some patients could show abnormal measurements, especially those with ICRS, who should be treated with caution in clinical practice.


Item Type:Article
Additional Information:

Submitted: July 9, 2020 / Accepted: February 8, 2021.

Uncontrolled Keywords:Keratoconus ; Aberrometry ; Ocular refraction ; Subjetive refraction ; Vision tests ; Corneal topography ; Corneal surgery
Subjects:Medical sciences > Medicine > Surgery
Medical sciences > Medicine > Ophtalmology
Medical sciences > Optics > Optometry
ID Code:67572
Deposited On:15 Feb 2022 17:58
Last Modified:16 Feb 2022 11:40

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