Comparative Evaluation of the Corneal and Anterior Chamber Parameters Derived From Scheimpflug Imaging in Arab and South Asian Normal Eyes

Prakash, Gaurav; Srivastava, Dhruv; Avadhani, Kavitha; Thirumalai, Sandeep Mark; Choudhuri, Sounak

doi:10.1097/ico.0000000000000544

Cited by 5 publications

(7 citation statements)

References 41 publications

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“…In other words, in our study, mixed race and Caucasian individuals have steeper corneas than African Black individuals, even though corneal astigmatism was comparable. Differences in corneal power, without differences in corneal astigmatism have previously been described when comparing ethnic groups 4,6,8 . However, other studies found differences in corneal power between ethnic groups 5,7 This is the rst study looking at corneal astigmatism among people of African Black, Mixed Race, and Caucasian descent, which is its main strength.…”

Section: Discussionmentioning

confidence: 82%

“…A margin of equivalence of 0.30 was used for the pairwise comparisons. The equivalence margin of 0.30 was based on clinical reasoning and previous research that showed a mean difference varying from 0.1 to 0.3 between ethnic groups 4,15,16 . A standard deviation of 1 was used for corneal astigmatism magnitude.…”

Section: Discussionmentioning

confidence: 99%

“…Our results are consistent with international studies, comparing corneal astigmatism between different ethnic groups. None of the studies found a statistically signi cant difference in corneal astigmatism magnitude between ethnic groups [4][5][6][7] . The following ethnic groups were represented in these studies: Caucasians, Asians, Turks, Syrians, Arabs, Bedouins, and Jews.…”

Section: Discussionmentioning

confidence: 99%

“…In international literature, several studies examining corneal astigmatism reported no difference between ethnic groups [4][5][6][7] . Only one study reported difference in corneal astigmatism magnitude and prevalence of against the rule astigmatism in a speci c age group between Turks and Syrians 5 .…”

Section: Introductionmentioning

confidence: 99%

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Corneal astigmatism in different ethnic groups in the Western Cape, South Africa.

Kleij

Smit²,

Bhika

2023

Preprint

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Objectives To determine whether corneal astigmatism magnitude is equivalent amongst individuals of African black, Mixed race and Caucasian descent in the Western Cape Province, South Africa. Methods Observational, retrospective study including 117 African black, 156 Mixed race and 100 Caucasian participants. Corneal astigmatism parameters were obtained using a Pentacam corneal topographer. Ethnicity was self-reported. Data were collected during an earlier prospective study. All the participants had clinically normal eyes. Results Corneal astigmatism magnitude was equivalent among the three groups. The astigmatism magnitude was − 0.7 (0.7) (median (Interquartile range)) in African blacks, -0.8 (0.7) in Mixed race and − 0.7 (0.6) D in Caucasians. No difference was found for J0 (p = 0.24) and J45 (p = 0.99). Astigmatism type differed between the three groups (p = 0.008). With the rule astigmatism was most prevalent in Caucasians (80.1%), followed by African blacks (71.3%) and Mixed race (65.3%). Corneas were steeper in Caucasians and mixed race, compared to African blacks (p = 0.001). K1, K2 and Kmax respectively, were 42.4, 43.2 and 43.7 for the African black, 43.2, 44 and 44.8 for the Mixed race and 43.2, 43.8 and 44.5 D for the Caucasian group. Thinnest point of the cornea in African blacks, Mixed race and Caucasians were 500 (39), 510 (40), and 534 (45) µm (p < 0.001). Conclusion Astigmatism magnitude is comparable between ethnic groups in South Africa. Hence, we suggest that astigmatism is not influenced by ethnicity. Corneal power and thinnest point differed between the three ethnic groups

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Section: Discussionmentioning

confidence: 82%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Corneal astigmatism in different ethnic groups in the Western Cape, South Africa.

Kleij

Smit²,

Bhika

2023

Preprint

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“…10 Furthermore, the mean ACD in our sample was higher than the mean reported by Feng et al, 19 )3.25 mm -3.11 mm(, but it fell within the normal variations recorded for numerous population groups. Likewise, higher mean corneal thickness and ACD values were observed in Arabs compared to South Asian eyes in a study conducted by Parkash et al, 24 who looked at the differences in the anterior segment measurements between these 2 groups. Evaluating the differences in these parameters between the various Arab countries would be an interesting area for future studies.…”

Section: Discussionmentioning

confidence: 90%

Corneal elevation indices and pachymetry values of Saudi myopes using scheimpflug imaging

Alsaif

Al-Sharif

Alsaif

et al. 2020

SMJ

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Objectives: To report the corneal elevation and thickness values for Saudi myopes and to evaluate the differences between these parameters in subgroups of this target population. Methods: Pentacam corneal topographic maps of the right eyes of patients visiting Al-Hokama Eye Clinic, Riyadh, Saudi Arabia, a tertiary eye center between January 2009 and December 2015 were retrospectively analyzed in this cross-sectional study. The patients were grouped into 3 categories based on their spherical readings: mild)-0.25 to-2.75D(, moderate)-3.00 to-5.75D(, and severe Original Article)≥-6.00D(. Furthermore, patients with cylindrical readings of ≥-1.00 diopter were categorized as having myopic astigmatism, whereas those with less than-1.00 cylindrical diopter were categorized as having simple myopia. Results: Our sample was comprised of 1,276 patients; 838)65.7%(had simple myopia and 438)34.3%(had myopic astigmatism. The values for the whole myopic group were as follows: anterior corneal elevation)AE(at the apex= 2.60±1.48)standard deviation(, thinnest AE= 2.56±1.68, posterior elevation)PE(at the apex= 3.67±3.58, thinnest PE= 4.92±3.81, central pachymetry= 550.09±34.29, apical pachymetry=550.73±34.64, and thinnest pachymetry= 546.30±34.61. All of the measurements, except the apical PE and thinnest PE, were statistically significant across the simple and myopic astigmatism groups)p<0.05(. Comparing the mild to moderate myopia groups revealed a significant difference in the apical AE)p=0.037(. Moreover, the comparison between the mild and severe myopia groups revealed that the apical PE and the thinnest PE, as well as the central, apical, and thinnest pachymetry values were statistically significantly different)p<0.05(. Conclusion: The corneal elevation indices and thicknesses specific to the Saudi myopes were found to be comparable to the international databases in terms of the elevation and thickness in some of the parameters.

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The effects of base curve aspheric orthokeratology lenses on corneal topography and peripheral refraction: A randomized prospective trial

Liu

Wang

et al. 2023

Contact Lens and Anterior Eye

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Comparative Evaluation of the Corneal and Anterior Chamber Parameters Derived From Scheimpflug Imaging in Arab and South Asian Normal Eyes

Cited by 5 publications

References 41 publications

Corneal astigmatism in different ethnic groups in the Western Cape, South Africa.

Corneal astigmatism in different ethnic groups in the Western Cape, South Africa.

Corneal elevation indices and pachymetry values of Saudi myopes using scheimpflug imaging

The effects of base curve aspheric orthokeratology lenses on corneal topography and peripheral refraction: A randomized prospective trial

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