Relative lens vault in subjects with angle closure

Kim, Young Kook; Yoo, Beong Wook; Kim, Hee Chan; Aung, Tin; Park, Ki Ho

doi:10.1186/1471-2415-14-93

Cited by 31 publications

(19 citation statements)

References 16 publications

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“…In the present study, based on AS-OCT scans, we investigated two novel biometric parameters: the AV, which represents the sum of the LV and the ACD, and the rLV, which represents the ratio of the LV to the AV. 20 We found that AV was significantly associated with a reduction in IOP after cataract surgery in multivariate regression analysis. We did not find any significant association between LT, LV, or rLV and IOP reduction.…”

Section: Discussionmentioning

confidence: 62%

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Lens parameters as predictors of intraocular pressure changes after phacoemulsification

Moghimi

Abdi

Latifi

et al. 2015

Eye

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Purpose To evaluate intraocular pressure (IOP) change after cataract surgery in nonglaucomatous eyes with narrow and open angles (OAs) and its relation to novel lens parameters measured by anterior segment optical coherence tomography (AS-OCT). Setting University affiliated hospital, Farabi Eye Hospital, Tehran, Iran. Design Prospective interventional case series. Methods In this prospective study, 85 nonglaucomatous eyes underwent phacoemulsification and lens implantation. Thirty-nine eyes had OAs and 46 eyes had narrow angles (NAs). IOP and biometric parameters were measured by AS-OCT preoperatively and 3 months after surgery. Change in IOP and its relation to biometric parameters, including lens vault (LV), anterior vault (AV), defined as the sum of the LV and the ACD, and relative LV (rLV), defined as the ratio of the LV to the AV, were evaluated. The main outcome measure was degree of IOP change after phacoemulsification. Results Of the 85 patients included in the analysis, 35 were male and 50 were female with an overall mean age of 62.2 ± 8.9 years. The average IOP reduction was − 4.95 ± 2.26 mm Hg, from a preoperative mean of 17.12 ± 2.47 mm Hg, at 3 months after cataract surgery. The amount of IOP reduction was significantly greater in the NA compared with the OA group. In multivariate linear regression analysis, preoperative IOP and AV were significantly associated with IOP decrease (all ≤ 0.03). Conclusion Cataract surgery results in IOP reduction in both OA and NA eyes. The amount of IOP reduction is related to AV.

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Section: Discussionmentioning

confidence: 62%

“…These two novel parameters are defined as the sum of the LV and the ACD and the ratio of the LV to the AV, respectively. 20 The purpose of the present study is to evaluate these novel lens parameters in nonglaucomatous eyes with NAs or OAs and their relation to IOP change after cataract surgery.…”

Section: Introductionmentioning

confidence: 99%

Lens parameters as predictors of intraocular pressure changes after phacoemulsification

Moghimi

Abdi

Latifi

et al. 2015

Eye

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“…13 Meanwhile, AV is a novel parameter that represents the vertical dimension of the eyeball's anterior segment and could potentially predict the risk of a patient's angle closure. 15 Thus, our data showed that both vertical and horizontal dimension of the eyeball's anterior segment in the angle-closure eyes with longer AL were larger than those of angle-closure eyes with shorter AL. This might explain that the occurrence of PAC is evidently biased toward shorter AL.…”

Section: Discussionmentioning

confidence: 68%

“…A recent study demonstrated that although the healthy population had longer ALs than the PAC population, the relative dimensions of the eyeball's anterior segment (relative AV) in these two populations were quite similar. 15 Interestingly, our findings showed that the relative dimension of the eyeball's anterior segment (relative AV) was smaller in angle-closure patients with longer AL than those with shorter AL, suggesting that the anterior and posterior portions of the eyeball elongate disproportionately in angle-closure eyes with longer AL. Meanwhile, the RLP was smaller in angle-closure eyes with longer AL than in those with shorter AL, which reveals that the position of the lens is relatively more anterior in these atypical angle-closure eyes with longer AL.…”

Section: Discussionmentioning

confidence: 74%

What Are the Characteristics of Primary Angle Closure With Longer Axial Length?

Chen

Jiang

et al. 2018

Invest. Ophthalmol. Vis. Sci.

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What are the characteristics of primary angle closure with longer axial length? Invest Ophthalmol Vis Sci. 2018;59:1354-1359. https://doi.org/10.1167 PURPOSE. To compare biometric parameters between primary angle closure with longer axial length (AL) and those with medium or shorter AL. METHODS.We prospectively recruited 138 primary angle-closure patients. Low-coherence interferometry and ultrasound biomicroscopy examinations were performed before laser peripheral iridotomy and pilocarpine treatment. AL was categorized as shorter (<22.5 mm), medium ( ‡22.5 to <23.5 mm), or longer ( ‡23.5 mm). Anterior chamber depth and width (ACD and ACW), lens vault (LV), anterior vault (AV), relative AV (AV/AL), relative lens position (RLP, [ACD þ 1/2 lens thickness]/AL), trabecular-ciliary angle (TCA), keratometry, and other biometric parameters were compared among different AL groups.RESULTS. Among 138 angle-closure patients, 15 (10.9%) patients had longer ALs, of which 11 (73.3%) were male. These angle-closure eyes with longer AL had flatter cornea (P ¼ 0.006 and 0.022 for flat and steep keratometry) and larger ACW (P ¼ 0.006), but smaller RLP (P ¼ 0.019) than those with medium AL; similarly, they had flatter cornea (P < 0.001 for both flat and steep keratometry), and larger ACW (P < 0.001), AV (P ¼ 0.004), and TCA (P ¼ 0.024), but smaller relative AV (P ¼ 0.040) and RLP (P ¼ 0.005) than those with shorter AL. No significant differences were found in the other parameters.CONCLUSIONS. Primary angle closure with longer AL was uncommon. Causes of angle closure in these atypical patients were manifold. These patients were predominantly male; they had smaller relative dimension of the anterior segment, flatter cornea, and more anterior RLP and less anteriorly rotated ciliary body compared with those angle-closure patients with relatively shorter AL.Keywords: myopia, primary angle closure, axial length, biometric parameters P rimary angle closure (PAC) with myopia has received increasing attention in recent years. This is not only because myopia, usually regarded as a protective effect against PAC, can still be observed in some angle-closure patients, 1-4 but also because this kind of PAC may significantly rise with the incremental rate of myopia in East Asia in the future.5 Recent researchers have highlighted that there is a considerable proportion of myopia in the PAC population. A Singaporean study showed that almost one-quarter of PAC was myopic, 5 whereas a Malaysian investigation found that the distribution of myopia was approximately 37% in PAC patients.6 Jin et al. 7 concluded that the increasing prevalence of myopia has minimal influence on the angle-closure prevalence. It seems that we are going to have more myopic PAC with the rise of myopia in the world, especially in East Asia. However, myopia by the definition of the refractive status in angle-closure patients is often misleading. It is well known that PAC usually occurs in the population older than 40 years, 8 so the myopia formation in these patients might be...

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“…After the scleral spurs are identified, the software calculated the iris, cornea, and lens parameters automatically. Table 1 shows the AS-OCT parameters and their definitions 12,17,[21][22][23][24][25] used in this study. After obtaining the images, APAC and phacomorphic angle closures eyes underwent LPI and cataract extraction, respectively, as part of their standard medical care.…”

Section: Anterior Segment-octmentioning

confidence: 99%