Biometric evaluation of myopic eyes without posterior staphyloma: disproportionate ocular growth

Khokhar, Sudarshan; Takkar, Brijesh; Agarwal, Esha; Gaur, Nripen; Ravani, Raghav; Venkatesh, Pradeep

doi:10.1007/s10792-017-0745-6

Cited by 9 publications

(13 citation statements)

References 31 publications

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“…Khokhar et al . 23 reported that the ACD and CCT did not lengthen based on the AL. Therefore, the longer the AL becomes, the longer the posterior vitreous body becomes, and the ARGOS defines the vitreous refractive index as 1.336.…”

Section: Discussionmentioning

confidence: 97%

Ocular biometry and refractive outcomes using two swept-source optical coherence tomography-based biometers with segmental or equivalent refractive indices

Omoto

Torii

Masui

et al. 2019

Sci Rep

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This study compared the axial length (AL), central corneal thickness (CCT), anterior chamber depth (ACD), lens thickness (LT), mean anterior corneal radius of curvature (Rm), and postoperative refractive outcomes obtained from two different swept-source optical coherence biometers, the ARGOS (Movu, Nagoya, Japan), which uses the segmental refractive index for each segment, and the IOLMaster 700 (Carl Zeiss Meditec, Jena, Germany), which uses an equivalent refractive index for the entire eye. One hundred and six eyes of 106 patients with cataracts were included. The refractive outcomes using the Barrett Universal II, Haigis, Hoffer Q, and SRK/T formulas were evaluated. The mean AL, CCT, ACD, and Rm differed significantly (P < 0.001) with the IOLMaster 700 (25.22 mm, 559 µm, 3.23 mm, and 7.69 mm) compared with the ARGOS (25.14 mm, 533 µm, 3.33 mm, and 7.66 mm). The mean LTs did not differ significantly. The percentages of eyes within ±0.50 and ±1.00 diopter of the predicted refraction did not differ significantly (P > 0.05). The accuracy of the intraocular lens power calculations was clinically acceptable with both biometers, although the ocular biometry using these two biometers exhibited certain differences.

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Section: Discussionmentioning

confidence: 97%

Ocular biometry and refractive outcomes using two swept-source optical coherence tomography-based biometers with segmental or equivalent refractive indices

Omoto

Torii

Masui

et al. 2019

Sci Rep

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“…Our results show that longer eyes had flatter corneas especially in subjects with high myopia which are consistent with the previously published studies. 17,33,34 Chang et al and Goss et al found that the anterior corneal surface was flatter in eyes with longer axial length. 17,35 Sang Hoon Park et al found that CC decreased as AL increased (r = -0.444, p <0.001), corneas were steeper in shorter eyes and flatter in longer eyes and they deduced that the reason might be an emmetropization effect to prevent myopic shift despite axial elongation.…”

Section: Discussionmentioning

confidence: 98%

Corneal Biometric Features and Their Association With Axial Length in High Myopia

Jin

Liu

Wang

et al. 2022

American Journal of Ophthalmology

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This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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“…We had noted a similar lack of correlation between anterior parameters in myopic patients in a previous study. [12] One may speculate these findings to have a simple mathematical explanation, that is, both AS and VCD contribute to AL. Hence, ratio of either of them to AL may have good relation to both.…”

Section: Discussionmentioning

confidence: 99%

“…In a recent study of myopic eyes undergoing refractive surgery, we showed that there is a major discord between anterior biometry and the axial length (AL) of the eye ball. [12] We found the growth of the eye ball to be highly disproportionate, thus accounting for certain difficult scenarios surrounding refractive procedures. However, in that study we had noted an important limitation in our inability to evaluate VCD as a correlate of AL due to our sampling method.…”

mentioning

confidence: 99%

“…However, in that study we had noted an important limitation in our inability to evaluate VCD as a correlate of AL due to our sampling method. [12] In this study, we evaluate the relationship between VCD and other biometric parameters. We also introduce VCD: AL as a parameter that may influence overall ocular biometry, and thus provide clues to the refractive status or ocular growth.…”

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confidence: 99%

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Evaluation of the vitreous chamber depth: An assessment of correlation with ocular biometrics

Takkar

Gaur

Saluja

et al. 2019

Indian J Ophthalmol

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Purpose:The mechanism of ocular growth eludes us and research on vitreous chamber depth (VCD) is lacking. The purpose of this study was to evaluate the role of VCD and its ratio to axial length (AL) in relation to ocular biometry.Methods:This retrospective study of patients planned for cataract surgery was performed at a tertiary center. Data regarding AL, anterior chamber depth (ACD), lens thickness (LT), and central corneal thickness (CCT) of 640 eyes was noted. Anterior segment (AS) was measured as sum of CCT, ACD, and LT, while VCD was calculated as the difference between AL and AS. Correlation of VCD and VCD: AL with ocular biometry was the primary outcome measure. Three groups were formed on the basis of AL and Pearson correlation coefficient (R) was applied.Results:Mean VCD was 15.38+/−1.14 mm. Mean VCD: AL was 0.66+/−0.02. VCD had a very strong relation with AL (R = 0.9, P < 0.001) only, whereas VCD: AL had a good-- strong relation with AL (R = 0.5, P < 0.001), AS (R = 0.7, P < 0.001), ACD (R = 0.3, P < 0.001), and LT (R = 0.5, P < 0.001). The relation of VCD: AL with AS was very strong across all groups (R ≤ - 0.8, P < 0.001 in all groups). 85% of eyes in group with AL <22 mm had VCD: AL <0.67, conversely 85% of eyes with AL >24.5 mm had VCD: AL >0.67.Conclusion:We found VCD to have the strongest relation with AL. VCD: AL was more consistent and showed a strong relation to ocular biometry across all ALs. This suggests the possible utility of the ratio VCD: AL while evaluating ocular growth, refractive status, and myopia-related complications.

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Biometric evaluation of myopic eyes without posterior staphyloma: disproportionate ocular growth

Cited by 9 publications

References 31 publications

Ocular biometry and refractive outcomes using two swept-source optical coherence tomography-based biometers with segmental or equivalent refractive indices

Ocular biometry and refractive outcomes using two swept-source optical coherence tomography-based biometers with segmental or equivalent refractive indices

Corneal Biometric Features and Their Association With Axial Length in High Myopia

Evaluation of the vitreous chamber depth: An assessment of correlation with ocular biometrics

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