Axial length/corneal radius of curvature ratio and refractive status in an adult Nigerian population

Badmus, SA; Ajaiyeoba, AI; Adegbehingbe, BO; Onakpoya, Oluwatoyin Helen; Adeoye, AO

doi:10.4103/njcp.njcp_183_16

Cited by 21 publications

(25 citation statements)

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“…In the current study, the correlation coefficient of the AL/CR ratio with the SE was greater than that of the AL with the SE; therefore, the AL/CR ratio may explain the total variation in the SE better than the AL alone. This trend also has been reported previously, 26,38 and the current results agreed with them.…”

Section: Discussionsupporting

confidence: 94%

“…AL/CR RATIO AND RELATIONSHIPS AMONG THE SE AND AL, CR, AND AL/CR RATIO: The distributions of the AL/CR ratio have been reported in different populations and age groups 31,[34][35][36][37][38][39][40][41] and the AL/CR ratios for myopia were between 2.9 and 3.1 and less than 2.9 for emmetropia and hyperopia. 26,27,[42][43][44][45][46] Table 4 summarizes the other studies.…”

Section: Discussionmentioning

confidence: 99%

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Ratio of Axial Length to Corneal Radius in Japanese Patients and Accuracy of Intraocular Lens Power Calculation Based on Biometric Data

Omoto

Torii

Hayashi

et al. 2020

American Journal of Ophthalmology

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MIKI KAMIKAWATOKO OMOTO, HIDEMASA TORII, KEN HAYASHI, MASAHIKO AYAKI, KAZUO TSUBOTA, AND KAZUNO NEGISHI PURPOSE: To evaluate the features of the axial lengthto-corneal radius (AL/CR) ratio in Japanese patients with cataracts and to determine the accuracy of intraocular lens (IOL) power calculation formulas according to the AL/CR features and the axial length (AL).DESIGN: Retrospective observational case series. METHODS: Setting was a clinical practice. Patient population was a total of 1,135 eyes (1,135 patients) with cataracts. Observation procedures included measurement of the AL and corenal radius (CR) by optical biometry and evaluation of the refractive outcomes by using the SRK/T, Holladay 1, Hoffer Q, Haigis, and Barrett Universal II formulas. Main outcome measurements were the features of the AL/CR ratio and the accuracy of IOL power calculations based on the AL/CR ratio and the AL.RESULTS: The mean AL/CR ratio was 3.15 ± 0.19. Significant weak negative correlations were observed between the spherical equivalent (SE) and AL (r [ L0.7489; P < .001) and between the SE and AL/CR ratio (r [ L0.8069; P < .001); no correlation was found between the SE and CR (r [ 0.0208, P [ .483). For medium ALs and high AL/CR ratios, the SRK/T formula performed less accurately. For long ALs and high AL/CR ratios, the Holladay 1 and Hoffer Q formulas performed less accurately. The Barrett Universal II formula performed well across a range of ALs and AL/CR ratios. CONCLUSIONS: The AL/CR ratio explained the total variation in the SE better than the AL alone. Surgeons should pay attention to the selection of IOL power calculation formulas in eyes with high AL/CR ratios. (Am J Ophthalmol 2020;-:---. Ó

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Section: Discussionsupporting

confidence: 94%

Section: Discussionmentioning

confidence: 99%

Ratio of Axial Length to Corneal Radius in Japanese Patients and Accuracy of Intraocular Lens Power Calculation Based on Biometric Data

Omoto

Torii

Hayashi

et al. 2020

American Journal of Ophthalmology

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“…No significant change was found in the eye axial length . which for patients with high myopia, is realted to refraction [15]. These results indicated that V4c-ICL was a safe and effective treatment for high myopia, and refraction was stable over time.…”

Section: Resultsmentioning

confidence: 67%

Long Term Assessment of the Quality of Visual-related Daily Activities after ICL (V4C) Implantation for Myopia and Myopic Astigmatism

Linghu

Liu²,

Liao

et al. 2018

Preprint

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Background: The purpose of the study was to evaluate long-term quality of visual related daily activities after Central Hole Collamer Lens implantation to treat myopia and myopic astigmatism. Methods: This retrospective study included 46 eyes (23 patients) receiving an ICL-V4c implantation. The follow up time was at least 24 m. Uncorrected visual acuity (UCVA), best corrected visual acuity (BCVA), refraction, eye axis, intraocular pressure, endothelial cell density (ECD), vault, and the patients’ satisfaction related to vision related daily activities were recorded at 6 m and 24 m. Results: The mean spherical equivalents were -0.14 ± 0.21 D and -0.12 ± 0.33 D at 6 m and 24 m after surgery, respectively. UCVA of all eyes were equal to or better than preoperative BCVA. The BCVA at 6 m and 24 m after implantation were -0.03 ± 0.08 LogMAR, and −0.03 ± 0.11 LogMAR, respectively, which was statistically better (P = 0.031) than that of pre-operation value of 0.07 ± 0.12 LogMAR. There was no significant differences (P > 0.05) between the pre operation and post operation ECD.At 24 m post operation, 10% of the patients complained of difficulty driving at night, but most of patient had satisfactory or very satisfactory vision-related daily activity scores. Some patients, 13%, were worried about the long-term safety and efficacy of the V4c-ICL implantation. Conclusions: Patients were very satisfied with their vision related daily activities after V4c-ICL implantation. With time, some patients worried about the permanent safety and efficacy.

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“…1 Although, this study did not find any correlation between spherical equivalent and corneal curvature, some studies revealed that the spherical refractive error has statistically highly significant positive correlation with corneal curvature but other studies reached a similar conclusion that no significant correlation was present between spherical refractive error and corneal curvature. 6,10,[15][16][17] Several reasons may account for these differences in results from different studies, such as differences in age groups, refractive error ranges, sample size, populations, ethnicities, statistical power of the studies and various methods of measurement of various ocular parameters. 6…”

Section: Discussionmentioning

confidence: 99%

“…9 Although the axial length has been found to be the most important singular, biometric variable affecting final refractive status of individuals, the relationship between corneal curvature and refractive status has been inconsistent. 10 It is not yet clear how the other ocular components such as corneal curvature affect myopia progression and stabilization. 11 Limited studies are available that have exclusively evaluated young Nigerian adults especially university students with high myopia.…”

Section: Introductionmentioning

confidence: 99%

Corneal curvature in young high myopic undergraduates in southern Nigeria

Okukpon¹,

Ojo²

2018

Int J Res Med Sci

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Background: Corneal curvature is important for contact lens fitting and management, ocular aberration analysis, corneal refractive surgery as well as diagnoses and management of corneal pathological conditions such as keratoconus and it is also an important biometric factor affecting refractive errors, myopia inclusive.Methods: This was an observational cross-sectional study conducted at the Optometry Teaching Clinic, Department of Optometry, University of Benin, Benin City, Edo State, Nigeria. Two hundred and twenty myopic eyes of 113 (54 males, 59 females) undergraduates students, between 16 and 25 years with myopia of -5.00 to -20.50 participated in this study. Non-cycloplegic refraction was done by retinoscopic measurement and spherical equivalent refraction (SER) of the eyes was calculated. The corneal curvature was determined with a Bausch and Lomb one position Keratometer (Bausch and Lomb Corp., USA).Results: The mean age, spherical equivalent, corneal curvature and corneal power were 20.44±2.24 years, ̶7.12±3.14DS, 7.72±0.26mm and 43.77±1.48D respectively. Most of the students had a myopia of -5.75 to -10.50DS (46.8%) and a corneal curvature of 7.61-7.90mm (46.82%). There was a difference between the corneal curvature of males and females (P=0.0001). A relationship was also found with gender and corneal curvature (P=0.001).Conclusions: This study found that high myopic females had shorter corneal curvature, with greater corneal powers than their males counterparts (P<0.01). We also found that gender had a significant relationship with the corneal curvature unlike age and the spherical equivalent which showed no relationship (P>0.01).

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Axial length/corneal radius of curvature ratio and refractive status in an adult Nigerian population

Abstract: This study has further confirmed that the AL remains a strong determinant of refraction, but a derived factor AL/CR accounts for more variation in final refractive status than AL in isolation.

Cited by 21 publications

References 0 publications

Ratio of Axial Length to Corneal Radius in Japanese Patients and Accuracy of Intraocular Lens Power Calculation Based on Biometric Data

Ratio of Axial Length to Corneal Radius in Japanese Patients and Accuracy of Intraocular Lens Power Calculation Based on Biometric Data

Long Term Assessment of the Quality of Visual-related Daily Activities after ICL (V4C) Implantation for Myopia and Myopic Astigmatism

Corneal curvature in young high myopic undergraduates in southern Nigeria

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