Three-dimensional choroidal vascularity index and choroidal thickness in fellow eyes of acute and chronic primary angle-closure using swept-source optical coherence tomography

AIM:To compare the three-dimensional choroidal vascularity index(CVI)and choroidal thickness between fellow eyes of acute primary angle-closure(F-APAC)and chronic primary angle-closure glaucoma(F-CPACG)and the eyes of normal controls.METHODS:This study included 37 patients with unilateral APAC,37 with asymmetric CPACG without prior treatment,and 36 healthy participants.Using swept-source optical coherence tomography(SS-OCT),the macular and peripapillary choroidal thickness and three-dimensional CVI were measured and compared globally and sectorally.Pearson’s correlation analysis and multivariate regression models were used to evaluate choroidal thickness or CVI with related factors.RESULTS:The mean subfoveal CVIs were 0.35±0.10,0.33±0.09,and 0.29±0.04,and the mean subfoveal choroidal thickness were 315.62±52.92,306.22±59.29,and 262.69±45.55μm in the F-APAC,F-CPACG,and normal groups,respectively.All macular sectors showed significantly higher CVIs and choroidal thickness in the F-APAC and F-CPACG eyes than in the normal eyes(P<0.05),while there were no significant differences between the F-APAC and F-CPACG eyes.In the peripapillary region,the mean overall CVIs were 0.21±0.08,0.20±0.08,and 0.19±0.05,and the mean overall choroidal thickness were 180.45±54.18,174.82±50.67,and 176.18±37.94μm in the F-APAC,F-CPACG,and normal groups,respectively.There were no significant differences between any of the two groups in all peripapillary sectors.Younger age,shorter axial length,and the F-APAC or F-CPACG diagnosis were significantly associated with higher subfoveal CVI and thicker subfoveal choroidal thickness(P<0.05).CONCLUSION:The fellow eyes of unilateral APAC or asymmetric CPACG have higher macular CVI and choroidal thickness than those of the normal controls.Neither CVI nor choroidal thickness can distinguish between eyes predisposed to APAC or CPACG.A thicker choroid with a higher vascular volume may play a role in the pathogenesis of primary angle-closure glaucoma.

Pentacam changes in primary angle-closure glaucoma after different lines of treatment

AIM: To assess the changes in the anterior chamber parameters using Pentacam following four different lines of treatment of primary angle-closure glaucoma(PACG).METHODS: A retrospective comparative study included 126 patients(126 eye) presented within 24-48 h after acute angle-closure glaucoma(AACG). Patients were divided into 2 groups: group A(68 eyes) with controlled intraocular pressure(IOP) ≤21 mm Hg, which included subgroup A1(34 eyes) with clear lens underwent Nd:YAG laser peripheral iridotomy(LPI) and subgroup A2(34 eyes) with cataract underwent standard phacoemulsification;and group B(58 eyes) with uncontrolled IOP, which included subgroup B1(30 eyes) with clear lens underwent trabeculectomy and subgroup B2(28 eyes) with cataract underwent combined phacoemulsification and trabeculectomy. Patients were fol owed up for at least 3 mo. Primary outcomes were Pentacam anterior segment measurements [anterior chamber angle(ACA) and depth(ACD)]. Secondary outcomes were changes in IOP, visual acuity(VA) and recorded complications. RESULTS: At the 3^(rd)month, there was significant increase in the ACA values in all studied groups compared to preoperative values(P<0.001). The highest percent of increase in ACA was recorded in phacotrabeculectomy group B2(128.40%). There was significant increase in ACD values at 3^(rd)month compared with baseline values(P<0.001) for groups A1, A2, and B2;without change in B1 trabeculectomy group. The maximum deepening of ACD was noticed in group B2 with 94.27% increase. Significantdecrease in postoperative IOP in groups A2, B1 and B2(P<0.001, P=0.014, and P<0.001 respectively). In group A1 there was significant increase in 3^(rd)month postoperative IOP from baseline values(P<0.001). The maximum decrease in IOP was noticed in group B2 with 59.54% decrease. VA improvement in 3^(rd)month postoperative was recorded in all studied groups, maximum VA improvement was observed in group B2 up to 0.2 log MAR.CONCLUSION: Pentacam can be a helpful tool in studying and comparing the effect of the different lines of management of PACG on the anterior chamber measures. Phacotrabeculectomy was proved to be an effective line for managing PACG with resultant significant increase in the anterior chamber parameters, IOP reduction as well as maximum VA improvement. LPI has only temporary effect on IOP with significant changes in ACA and ACD. Phacoemuslification alone can be an option in treating PACG. Trabeculectomy resulted in temporary increase in the anterior chamber parameter which subsequently returned to baseline values.

Intraocular pressure modifications in patients with acute central/hemicentral retinal vein occlusions

Intraocular pressure(IOP)modifications in patients with acute central/hemicentral retinal vein occlusions(RVOs)consist in IOP reductions and increases.The IOP reduction is due to a transitional hyposecretory phase of the aqueous humor,that increases gradually until 3 mo after the venous occlusion onset,and then finally disappears after month 4 th.The IOP increases lead to the ocular hypertension and glaucoma.The possible pathogenetic correlations between ocular hypertension/glaucoma and acute central/hemicentral RVOs have been classified into three groups:1)the venous occlusion precedes the ocular hypertension/glaucoma causing neovascular glaucoma and secondary angle-closure glaucoma without rubeosis;2)the ocular hypertension and the glaucoma precede the venous occlusion and favor its appearance(ocular hypertension,primary angle-closure,primary angle-closure glaucoma,and open angle glaucomas);and 3)the venous occlusion and the ocular hypertension/glaucoma are mostly age dependent appearances due to common vascular and collagen alterations,lacking a causal connection between the 2 conditions.

激光虹膜根切术对APACG缓解期患者的疗效

目的研究激光虹膜根切术对原发性急性闭角型青光眼(APACG)缓解期患者眼压及中央前房深度的影响,为临床治疗提供参考。方法随机选取2013年5月至2016年6月惠州市第一人民医院门诊治疗的APACG缓解期患者100例,依随机表对照法分为治疗组50例和对照组50例。两组患者均接受视力检查,停用降压药物5 d后测量眼压及房水流畅系数,治疗组接受激光虹膜根切术治疗,对照组接受激光周边虹膜成形术治疗。治疗前后3 d进行超声生物显微镜(UBM)检查,并且于治疗后2 h、6 h及3 d时测量眼压。结果治疗后治疗组患者视力恢复优于对照组,差异有统计学意义(P<0.05);治疗3 d后治疗组眼压优于对照组,差异有统计学意义(P<0.05);治疗组中央前房深度比对照组深,差异有统计学意义(P<0.05)。结论 APACG患者经激光虹膜根切术较经激光周边虹膜成形术后眼压稳定,视力更好,中央前房深度更深,并且激光虹膜根切术能有效解除瞳孔阻滞。