The Distribution Pattern of Ocular Residual Astigmatism in Chinese Myopic Patients

Tang, Cuirong; Du, Zijing; Wu, Guanrong; Tan, Xuanyun; Zang, Siwen; Yu, Honghua; Hu, Yijun

doi:10.3389/fmed.2022.763833

Cited by 6 publications

(12 citation statements)

References 41 publications

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“…Yuta Ueno and associates found that the difference between horizontal and vertical corneal thickness was correlated with the posterior corneal astigmatism ( 32 ), Zhou X etc., discovered that the front and back curvatures and the back astigmatism correlate with the distribution of corneal thickness ( 33 ). In addition, we also found that myopia is associated with increased astigmatism, which was also found in a large German population-based study ( 34 ).…”

Section: Discussionsupporting

confidence: 88%

Age- and gender-related characteristics of astigmatism in a myopic population

Yang

Jiang²,

Cui³

et al. 2022

Front. Med.

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PurposeTo explore age- and gender-related differences of refractive and corneal astigmatism in myopic patients looking for refractive surgery.DesignA retrospective cross-sectional study.Materials and methodsThe medical files of candidates looking for corneal refractive surgery between 2019 and 2021 were reviewed, demographic and refractive parameters including age, gender, refractive status, and corneal parameters were analyzed.ResultsA total of 1,417 eyes of 1,417 patients (453 males and 964 females) were included. Males had thicker cornea than females, while females had steeper cornea than males, there was no gender-related difference in refractive and corneal astigmatism depending on patients’ age. There was no difference in refractive astigmatism among different age group from 18 to 50 years, while corneal astigmatism had a shift from with-the rule (WTR) to against-the-rule (ATR) with increasing age. Age, central corneal thickness (CCT), sphere, refractive astigmatism (RA), and corneal curvature (Km) were correlated with corneal astigmatism (CA) (standardized coefficients of are 0.006, p = 0.011 for age, −0.001, p = 0.004 for CCT, and −0.027, p < 0.001 for sphere, 0.61, p < 0.001 for RA, −0.05, p < 0.001 for corneal curvature).ConclusionRefractive astigmatism is stable until the age of 50 years in myopic patients looking for refractive surgery, while corneal astigmatism showed a shift from WTR to ATR with advancing age. Age, CCT, sphere, refractive astigmatism and corneal curvature (Km) were correlated with corneal astigmatism.

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Section: Discussionsupporting

confidence: 88%

Age- and gender-related characteristics of astigmatism in a myopic population

Yang

Jiang²,

Cui³

et al. 2022

Front. Med.

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“…It was approved by the Institutional Review Board (IRB) of Guangzhou Aier Eye Hospital (GZ), Shenyang Aier Eye Hospital (SY), Wuhan Aier Eye Hospital (WH), Chengdu Aier Eye Hospital (CD) and Hankou Aier Eye Hospital (HK) and conducted according to the tenets of the Declaration of Helsinki. Our study was only a review of medical records from which patients could not be identified, so the IRBs decided to waive the requirement to get informed consent 25–27 . We reviewed the digital medical records of myopic patients who had refractive surgery between 2017 and 2020 in the five centers.…”

Section: Methodsmentioning

confidence: 99%

“…Only the right eye of the participants was included in the analysis. Exclusion criteria were patients wearing soft contact lenses within 2 weeks or rigid gas‐permeable lenses within 1 month before the Pentacam examination, and those with eye diseases (glaucoma, trauma, previous ocular surgery, keratoconus or suspected keratoconus severe dry eye, corneal degeneration, or dystrophy) 25,26 …”

Section: Methodsmentioning

confidence: 99%

“…This retrospective cross-sectional study comprised 7893 eyes of 7893 myopic patients. 25,26 It was approved by the Institutional Review Board (IRB) of Guangzhou Aier Eye Hospital (GZ), Shenyang Aier Eye Hospital (SY), Wuhan Aier Eye Hospital (WH), Chengdu Aier Eye Hospital (CD) and Hankou Aier Eye Hospital (HK) and conducted according to the tenets of the Declaration of Helsinki. Our study was only a review of medical records from which patients could not be identified, so the IRBs decided to waive the requirement to get informed consent.…”

Section: Subjectsmentioning

confidence: 99%

“…Our study was only a review of medical records from which patients could not be identified, so the IRBs decided to waive the requirement to get informed consent. [25][26][27] We reviewed the digital medical records of myopic patients who had refractive surgery between 2017 and 2020 in the five centers. Myopic patients aged 18 to 40-year-old with a spherical equivalent (SE)≤−0.50 D and good quality of Pentacam examination images were selected.…”

Section: Subjectsmentioning

confidence: 99%

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The distribution pattern of corneal volume in Chinese myopic patients from multiple centers

Tang

Qin

Wang

et al. 2023

MedComm – Future Medicine

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Corneal volume (CV) is a useful index for detecting forme fruste keratoconus from normal corneas. It can be used to evaluate the whole cornea, since it can measure corneal areas up to 10 mm in diameter. Thus, CV has become the clinicians' interest as a diagnostic tool of corneal ectatic disease and a measure of corneal integrity to determine suitability for refractive surgery. We conducted a cross‐sectional study including 7893 myopic patients from five ophthalmic centers to investigate the distribution pattern of CV. Our study showed that distribution of CV‐3, CV‐5, and CV‐7 mm were slightly positively skewed and the 2.5th to 97.5th percentiles were 3.6–4.4, 10.4–12.8, 22.5–27.5 mm3, respectively. Central corneal thickness (CCT) was significantly correlated with CV in all measurement regions. The correlation between CV and CCT showed an inconsistent trend with the increase of age. The correlation coefficient between CV and CCT did not change significantly with the increase of myopia degree in low to moderate myopia, but fluctuated significantly in high myopia (less than −6.0 diopters). According to our results, corneal volume follows a slightly positively skewed distribution pattern in myopic Chinese patients. The information is useful for screening refractive surgery candidates and assessing the risk of corneal refractive surgery.

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Ocular biometrics in eyes with different white-to-white corneal diameter in young myopic adults

Jiang,

Du,

Tang

et al. 2024

Sci Rep

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The interactions between white-to-white corneal diameter (WTW) and other ocular biometrics are important for planning of refractive surgery and understanding of ocular structural changes in myopia, but such interactions are rarely investigated in young myopic adults. This is a retrospective study involving 7893 young myopic adults from five centers. WTW and other ocular biometrics were measured by Pentacam. The ocular biometrics included anterior corneal curvature (AK) and posterior corneal curvature (PK), central corneal thickness (CCT) and corneal volume (CV), anterior and corneal eccentricity and asphericity, anterior corneal astigmatism (ACA) and posterior corneal astigmatism, anterior chamber depth (ACD), and anterior chamber volume (ACV). The ocular biometrics were compared among eyes of different WTW quartiles. Multivariate linear regression was used to assess the linear associations between WTW and other ocular biometrics adjusting for age, gender and spherical equivalent. In eyes of different WTW quartiles, other ocular biometrics were also significantly different (all P < 0.05). After adjusting for age, gender and spherical equivalent, WTW was positively correlated to AK (β = 0.26 to 0.29), ACA (β = 0.13), anterior corneal asphericity (β = 0.05), PK (β = 0.33 to 0.34), posterior corneal asphericity (β = 0.13), ACD (β = 0.29), and ACV (β = 40.69), and was negatively correlated to CCT (β = − 6.83), CV (β = − 0.06 to − 0.78), anterior corneal eccentricity (β = − 0.035), and posterior corneal eccentricity (β = − 0.14) (all P < 0.001). In conclusion, we found that in young myopic adults, larger WTW was associated with thinner corneal thickness, flatter corneal curvature, more anterior corneal toricity, less corneal eccentricity and asphericity, and broader anterior chamber. Our findings may fill in the gap of literature, and help us better understand how the anterior segment structures interact with the WTW in myopia.

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The Distribution Pattern of Ocular Residual Astigmatism in Chinese Myopic Patients

Cited by 6 publications

References 41 publications

Age- and gender-related characteristics of astigmatism in a myopic population

Age- and gender-related characteristics of astigmatism in a myopic population

The distribution pattern of corneal volume in Chinese myopic patients from multiple centers

Ocular biometrics in eyes with different white-to-white corneal diameter in young myopic adults

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