A new intraocular lens marker to guide the implantation of toric intraocular lenses in small and mid-dilating pupils

Insufficient pupillary dilatation is a significant challenge during cataract surgery, as it increases the risk of various intraoperative complications. Implantation of toric intraocular lenses (TIOL) is particularly difficult in eyes with small pupils, as the toric marks are provided in the periphery of the IOL optic, making the visualization of the same difficult for proper alignment. Attempts at visualizing these marks using a second instrument such as a dialler or iris retractor lead to additional manipulations in the anterior chamber resulting in increased chances of postoperative inflammation and intraocular pressure rise. A new intraocular lens (IOL) marker to guide the implantation of TIOLs in eyes with small pupils is described, which can potentially be beneficial in achieving accurate alignment of toric IOLs in small pupils, without the need for additional manipulations, thus improving safety, efficacy, and success rates of TIOL implantation in these eyes.

A novel Y-shaper and chopper for small pupil management in cataract surgery: The initial experience

Small pupil is a well-known risk factor for causing cataract surgery complications such as vitreous loss, anterior capsular tear, increased inflammation, and an irregular pupil shape. Because all currently available pharmacological approaches of dilating the pupil before or during cataract surgery cannot guarantee the result, the surgeon sometimes resorts to the use of mechanical pupil-expanding devices. However, these devices can increase the overall surgical cost and operative time. Very frequently, a combination of the two is needed; thus, we present the Y-shaped chopper designed by the authors, which serves the purpose of managing the intra-operative miosis and allows simultaneous nuclear emulsification.

Effects of OASIS iris expander in phacoemulsification surgery of cataract with small pupil / 眼科新进展

Objective To assess the outcomes of OASIS iris expander in phacoemulsification surgery of cataract with small pupil.Methods A prospective case-control study was conducted in 22 microcoria cataract patients (22 eyes).And they were randomly divided into group A and B,in which the pupils of group A were dilated by tearing instruments in 13 eyes,and the pupils of group B were dilated using OASIS iris expander in 9 eyes.All patient underwent phacoemulsification with 3.2 mm clear corneal incision and were followed up at postoperative 1 week,1 month,3 months and 6 months.Finally,the best corrected visual acuity (BCVA),intraocular pressure (IOP),corneal endothelial cell counts,pupil size before and after surgery were recorded and analyzed by an independent sample t test.Results All procedures were completed successfully by the same skilled doctor.Intraocular lenses were implanted in capsule completely,and no complications occurred.At 6 months after operation,patients'BCVA in group A (0.41 ± 0.30) and group B (0.77 ± 0.23) was significantly higher than that in group A (0.17 ±0.14) and group B (0.16 ±0.14) before operation,but there was no statistical difference between the two groups (all P ＞0.05);whereas there was no significant change in the IOP of group A and B at 6 months after operation (1 kPa =7.5 mmHg) and before operation [(14.22 ±6.00) mmHg vs.(15.70 ± 5.70) mmHg)] (all P ＞ 0.05).Moreover,corneal endothelial cell counts in group A [(1486 ±718) cells · mm-2] and B [(1246 ±516)cells · mm-2] were significantly smaller than those before operation [(2498 ±564)cells · mm-2 vs.[(2424 ± 640) cells · mm-2],with no significant difference (P=0.091).The postoperative diameter of the pupil in group A [(4.00 ±0.88) mm] and group B [(4.70 ± 1.57) mm] after operation was larger than that in group A [(2.30 ±0.35)mm] and group B [(1.94 ±0.50)mm] before operation,and there was no statistical difference between the two groups (all P ＞0.05).Conclusions OASIS iris expander can help to dilate and hold pupils and does not affect the postoperative visual acuity and intraocular pressure in mlcrocoria cataract phacoemulsification.The postoperative pupils become larger,and it is necessary to pay attention to protect corneal endothelial cell during usage of OASIS iris expander.

Effect of built-in type OASIS iris expander in phacoemulsification surgery for cataract with small pupil / 国际眼科杂志(Guoji Yanke Zazhi)

@#AIM: To observe the effect of built-in type OASIS iris expander in phacoemulsification surgery for cataract with small pupil. <p>METHODS: Totally 44 cataract patients with small pupil were treated in our hospital from January 2016 to October 2017 were randomly divided into the control group(22 cases, 31 eyes)and the observation group(22 cases, 30 eyes). The patients in control group was treated by conventional phacoemulsification surgery, within surgery the small pupils were dilated by cleavage and lens position hook; the patients in observation group use OASIS iris expander within surgery. The best corrected visual acuity(BCVA), corneal endothelial cell counts, pupil size, intraocular pressure(IOP)of two groups before and after surgery were compared and analyzed, and the application effect of built-in type OASIS iris expander was evaluated. <p>RESULTS: At 1mo after operation, the BCVA of the two groups were significantly improved, and the BCVA of the observation group(0.09±0.04)was significantly better than that of the control group(0.20±0.03), the difference was statistically significant(<i>P</i><0.05). At 1mo after operation, the corneal endothelial cell counts of the two groups were significantly decreased, but the corneal endothelial cell counts of the observation group(2455.77±52.98/mm²)were significantly higher than those of the control group(2298.94±49.12/mm²), the difference was statistically significant(<i>P</i><0.05). At 1mo after operation, the pupil diameter of the two groups was enlarged(<i>P</i><0.05), and the pupil diameter of the observation group(3.52±1.14mm)was larger than that of the control group(3.15±1.02mm, <i>P</i>>0.05). At 6mo after operation, the pupil diameter of the two groups was significantly enlarged(<i>P</i><0.05), but there was no significant difference in the pupil diameter between the two groups(<i>P</i>>0.05). At 1mo after operation, intraocular pressure in both groups was lower than that before operation(<i>P</i><0.05), and the intraocular pressure in observation group(13.40±1.73mmHg)was lower than that in control group(13.93±1.98mmHg, <i>P</i>>0.05). At 6mo after operation, intraocular pressure in both groups was lower than that before operation and 1mo after operation(<i>P</i><0.05), but there was no significant difference in intraocular pressure between the two groups at 6mo after operation(<i>P</i>>0.05). <p>CONCLUSION: The OASIS built-in iris dilator can improve the best corrected visual acuity, reduce intraocular pressure and expand pupil diameter in small pupil phacoemulsification.

Clinical study of phacoemulsification in small pupil cataract after filtering operation of glaucoma / 国际眼科杂志(Guoji Yanke Zazhi)

AIM: To investigate the clinical effects of phacoemulsification and surgical techeniques in small pupil cataract after filtering operation of glaucoma. METHODS: Thirty-six cases ( 36 eyes ) of small pupil cataract after filtering operation of glaucoma were underwent phacoemulsification combined with foldable intraocular lens implantation. Postoperative visual acuity, intraocular pressure filtration bleb and complications were observed. The follow-up time was 3mo. RESULTS: The preoperative uncorrected visual acuity (UCVA) or best-corrected visual acuity ( BCVA) ≤0. 3 were in all patients. Postoperativerly, the UCVA or BCVA≥0. 3 after 1wk and 3mo were achieved in 23 eyes (63.89%) and 34 eyes (94. 44%). BCVA was CONCLUSION: Phacoemulsification in small pupil cataract after filtering operation of glaucoma was complex, and reasonable application of operation skills can still achieve better clinical results. The main factor of affecting the visual acuity is pre-existing retinal optic neuropathy.

A Case of Intraoperative Floppy Iris Syndrome in a Patient Using Tamsulosin

PURPOSE: To report a case of Intraoperative Floppy Iris Syndrome (IFIS) experienced during pars plana vitrectomy and phacoemulsification in a patient using tamsulosin, which is a selective alpha 1 adrenergic antagonist. CASE SUMMARY: A 77-year-old male who had used tamsulosin for the previous month for prostate cancer visited our clinic with left visual disturbance, that had developed a week earlier. The best-corrected visual acuity of the left eye was 0.02 and both pupils showed incomplete mydriasis. Pars plana vitrectomy and phacoemulsification with PCL implantation were performed on his left eye to correct a left cataract and retinal vein occlusion with vitreous hemorrhage. Phacoemulsification idenfied a billowing iris and progressive pupillary constriction. Therefore, we administered an intracameral epinephrine injection and applied an iris hook. The procedure was completed successfully without any complications. The best-corrected visual acuity of the left eye was good as at 0.9, and iris depigmentation and atrophy were checked two months postoperatively in the right eye, which had not had any previous surgical history. CONCLUSIONS: A detailed medical history taking is essential because IFIS may raise the risk of intraoperative complications, such as posterior capsule rupture, especially when the small pupil is small. Safe procedures must be planned with cessation of tamsulosin at least a week preoperatively.

A Case of Hallermann-Streiff Syndrome

PURPOSE: We report a case of Hallermann-Streiff syndrome with 360 degrees posterior synechiae, small pupils and aphakia. METHODS: A five-year-old female presented with decreasing visual acuity of both eyes. Visual acuity was not checkable due to mental retardation. Microcornea, microphthalmia, nystagmus and esotropia were found, and a fundus examination was not available due to 360 degrees posterior synechiae and small pupils. She had developmental delays, bird-like face and hypotrichosis. A pediatric physician was consulted who diagnosed her with Hallermann-Streiff syndrome. Refraction and fundus examinations were impossible due to her small pupils, so synechiolysis was done. RESULTS: After synechiolysis and pupil dilatation in right eye with iris retractors, continuous curvilinear capsulorhexis (CCC) was attempted. However, the anterior capsule was unusually fragile and fibrtic. Therefore, the CCC failed. In addition, the crystalline lens and the zonule were not found. The posterior capsule was fragile similar to the anterior capsule. Complete posterior CCC (PCCC) was impossible. We could not find any formed vitreous in the vitreous cavity during anterior vitrectomy. We diagnosed the condition as aphakia with only two layers of membranes. Two weeks later, synechiolysis in the left eye was done. The left eye was also diagnosed with aphakia, and only synechiolysis was performed. CONCLUSIONS: The possibility of aphakia must be always considered in cases of Hallermann-Streiff syndrome.

A Case of Hallermann-Streiff Syndrome

PURPOSE: We report a case of Hallermann-Streiff syndrome with 360 degrees posterior synechiae, small pupils and aphakia. METHODS: A five-year-old female presented with decreasing visual acuity of both eyes. Visual acuity was not checkable due to mental retardation. Microcornea, microphthalmia, nystagmus and esotropia were found, and a fundus examination was not available due to 360 degrees posterior synechiae and small pupils. She had developmental delays, bird-like face and hypotrichosis. A pediatric physician was consulted who diagnosed her with Hallermann-Streiff syndrome. Refraction and fundus examinations were impossible due to her small pupils, so synechiolysis was done. RESULTS: After synechiolysis and pupil dilatation in right eye with iris retractors, continuous curvilinear capsulorhexis (CCC) was attempted. However, the anterior capsule was unusually fragile and fibrtic. Therefore, the CCC failed. In addition, the crystalline lens and the zonule were not found. The posterior capsule was fragile similar to the anterior capsule. Complete posterior CCC (PCCC) was impossible. We could not find any formed vitreous in the vitreous cavity during anterior vitrectomy. We diagnosed the condition as aphakia with only two layers of membranes. Two weeks later, synechiolysis in the left eye was done. The left eye was also diagnosed with aphakia, and only synechiolysis was performed. CONCLUSIONS: The possibility of aphakia must be always considered in cases of Hallermann-Streiff syndrome.

The Clinical Results of Small Pupil Phacoemulsification

Phacoemulsification of cataracts with small pupils would induce serious complications in some instance, but we could perform phacoemulsification and IOL implantation in the posterior chamber without any serious complications.We did not need any iris retractors or adjacent iris surgery.Thirty-one eyes of 28 patients with a pupil diameter equal to or less than 4 mm at the beginning of the procedure were reviewed.We analyzed them in the preoperative ocular problems, the size of pupil and the method of enlargement, the technique of nucleus removal, complications, and vision after six months follow-up.Preoperative pupillary diameter was less than 3 mm in 26 cases (83.9%), the most frequent preoperative ocular problem was uveitis with 19 eyes (61.36%).Removing pupillary membrane, releasing of synechiae and mechanical pupillary stretch followed by viscoelastic injection were effective in pupillary expansion.Central phaco chop technique was effective in small pupil cases.In complications, focal corneal edema in 7 eyes and mild iris damage in 6 eyes during surgery.Postoperatively, fibrinous reaction developed in 8 eyes.Postoperative corrected vision of 0.5 or better was in 15 eyes (48.4%), and 22 eyes (71%)had visual increment by 2 lines or more in the Hann's vision chart.In conclusion, phacoemulsification of cataracts with small pupils could be performed safely without serious complications, even with no iris retractor or iris surgery).