Secondary positioning of rotationally asymmetric refractive multifocal intraocular lens in a patient with glaucoma: A case report

Abstract

BACKGROUND

Asymmetric multifocal intraocular lenses (IOLs) are now widely used in the modern cataract surgery, providing a good level of visual performance over a range of distances and high postoperative patient satisfaction. We report a case of improved visual quality after shifting the near segment of an asymmetrical multifocal IOL to the superotemporal placement in the dominant eye of a glaucoma patient.

CASE SUMMARY

A 72-year-old woman with bilateral glaucoma underwent phacoemulsification in the dominant eye (left eye) with implantation of an asymmetrical multifocal IOL. Postoperative uncorrected distance visual acuity (UDVA) was 0.0 logMAR (20/20 Snellen) and uncorrected near visual acuity (UNVA) was 0.1 logMAR (20/25 Snellen). Two weeks later, the patient presented to our clinic with decreased vision due to migration of lens epithelial cells to IOL anterior surface and edema of corneal endothelial cells. Anterior capsule polishing and superotemporal placement of near segment [+3.00 diopter (D) addition (add)] of IOL were performed. As a result, UDVA at the first week and first year after reposition was 0.0 logMAR (20/20 Snellen), and compared with 0.3 logMAR (20/40 Snellen) in the first week, the UNVA was improved to 0.0 logMAR (20/20 Snellen) one year after surgery.

CONCLUSION

The postoperative inflammatory reaction and lens epithelial cells proliferation were obvious in this glaucoma patient. Capsule polishing and rotation of the lens were beneficial to the patient, which not only enhanced the patient's vision, but also improved the patient's satisfaction. Therefore, glaucoma patients need to be cautious of implanting multifocal IOLs. Placement of a near segment of an asymmetrical multifocal IOL in the dominant eye should be performed on an individual basis.

Key Words: Cataract surgery, Glaucoma, Rotationally asymmetric refractive multifocal intraocular lens, Visual quality, Patient satisfaction, Case report

Core Tip: Based on the design concept of asymmetric region refraction, the placement of asymmetric multifocal intraocular lenses (IOLs) is particularly important. Here, we report the case of a glaucoma patient undergoing cataract surgery with an asymmetric multifocal IOL implanted in the dominant eye. After 2 wk, the lens epithelial cells proliferated rapidly and visual acuity decreased significantly, which was recovered after capsular polishing combined with IOL rotation. By reporting this case, we hope to provide new insights into the implantation of asymmetric multifocal IOLs in patients with glaucoma.

INTRODUCTION

Cataract is the leading cause of blindness in the world. The development of the intraocular lens (IOL) and phacoemulsification as a technique for cataract removal could be considered as the two most significant strides that have been made in this surgical field[1]. With the development of science and technology, the choice of IOL is becoming more and more diversified and personalized. Asymmetric multifocal IOLs are now widely used in the modern cataract surgery, which provide excellent levels of visual performance at a range of distances as well as high postoperative patient satisfaction[2-4]. Asymmetrical multifocal IOLs, such as the SBL-3 (Lenstec, Inc.) as we mentioned in this case, provide their multifocality through a refractive design by incorporating a near vision section in the IOL[5]. Therefore, the SBL-3 is an asymmetric multifocal IOL with a +3.0 D near portion and a seamless transition zone between distance section and near section, and the asymmetric nature means that the position of the near segment must be considered.

CASE PRESENTATION

Chief complaints

A 72-year-old woman was referred to our clinic with a complaint of decreased visual acuity for 1 wk following cataract surgery performed in the left eye 2 wk ago.

History of present illness

The patient underwent an uneventful phacoemulsification cataract surgery for the left eye at our department 2 wk ago, and a rotationally asymmetric refractive multifocal IOL (SBL-3, Lenstec, Inc.) was chosen and implanted with the near segments placed inferonasally. The first day post-surgery, uncorrected distance visual acuity (UDVA) was 0.0 logMAR (20/20 Snellen) and uncorrected near visual acuity (UNVA) was 0.1 logMAR (20/25 Snellen). Preoperative biometric data are given in Table 1.

Table 1 Preoperative biometric data.

Parameter	Left eye
Axial length (mm)	22.46
K1 (D)	44.94 @ 55°
K2 (D)	45.18 @ 145°
ACD (mm)	2.23
Angle kappa (mm)	0.06 @ 56°
Angle alpha (mm)	0.32 @ 28°
Total corneal astigmatism (D)	1.0

K: Keratometry; D: Diopters; ACD: Anterior chamber depth.

History of past illness

The patient had bilateral primary angle closure glaucoma treated by laser peripheral iridectomy before at a local hospital, bilateral intraocular pressure was normal with no glaucoma medication before cataract surgery, and she had no history of allergies, trauma, surgery, or systemic disease.

Personal and family history

The patient was married and had two sons. She had no family history of ocular disease.

Physical examination

The patient presented to our clinic for reexamination with deterioration in the UDVA to 1.0 logMAR (20/200 Snellen) and in the corrected distant visual acuity of 1.0 logMAR (20/200 Snellen). Using a slit lamp, the swelling of the corneal endothelium and proliferation of lens epithelial cells crawling over the surface of the IOL could be clearly seen. Meanwhile, the IOL was in positive position, without any tilt or decentration, and the near segment was located in inferonasal orientation (Figure 1).

Figure 1 Slit lamp examinations 2 wk after phacoemulsification in the left eye. A: The swelling of the corneal endothelium and the proliferation of lens epithelial cells are most pronounced (yellow arrow) over the surface of the intraocular lens; B: The intraocular lens is centered with the near segment placed inferonasally (blue: near segment; green: distant segment).

FINAL DIAGNOSIS

IOL (left), complicated cataract (right), primary angle closure glaucoma (both), and status after laser peripheral iridectomy (both).

TREATMENT

We performed surgery for polishing the capsule and repositioning the IOL. During surgery, the anterior capsule was polished with a polisher to reduce the incidence of capsular contraction syndrome and posterior capsular opacification (PCO). Meanwhile, the near segment of IOL was shifted to the superotemporal placement, and coinciding transition zone of IOL with angle Kappa was avoided. At the end of the operation, the central position of the IOL was checked to see whether the light projection of the microscope was on the central point of IOL (Figure 2). Postoperatively, the patient was treated with a schedule of levofloxacin 0.5%, prednisolone, and pranoprofen eyedrops for 4 wk.

Figure 2 Intraoperative images of the rotating lens. A: Preoperatively, the light projection of the microscope coincides with the center of the intraocular lens (IOL); B: Separating capsulorhexis opening with a needle; C: Polishing anterior capsule. The laser hole (yellow arrow) after peripheral iridectomy is clearly visible; D: Locating the position of the IOL after rotation with a ring manually; E: Adjusting the position of the IOL with an IOL hook; F: The light projection of the microscope is on the central point of the IOL after rotation.

OUTCOME AND FOLLOW-UP

The first day after rotation, UDVA and UNVA were 0.2 logMAR (20/32 Snellen) and 0.3 logMAR (20/40 Snellen), respectively. UDVA improved to 0.0 logMAR (20/20 Snellen) 1 wk later (Table 2), and the intraocular pressure was 16 mmHg, which have remained stable during follow-up. One year after rotation, when she checked again, we found that she had a cataract surgery on her right eye at another hospital half a year ago, and the type of the IOL was the same as that on the left. In addition, the near segment of the lens on the right was positioned inferiorly with slight nasal deviation. For the right eye, UDVA and UNVA were 0.0 logMAR (20/20 Snellen) and 0.10 logMAR (20/25 Snellen), respectively. While for the left eye, UDVA and UNVA were 0.0 logMAR (20/20 Snellen) and 0.0 logMAR (20/20 Snellen), respectively. After a series of examinations, the lens position of the left eye was still positive, which almost was unchanged from the previous. Visual quality was assessed using OPD Scan III (Nidek Inc., Tokyo, Japan), and the tilt was acceptable in both horizontal and vertical directions without adversely affecting visual quality. At the same time, the lens position was also positive with no obvious tilt when viewed using ultrasound biomicroscopy (Supplementary Figure 1). The patient was very satisfied with the distant and near visual acuity, and achieved excellent visual performance.

Table 2 Preoperative and postoperative visual acuity (log MAR, left eye).

	Preoperative	Postoperative 1 d	Postoperative 2 wk	1 d after rotation	1 wk after rotation	1 yr after rotation
UDVA	0.2 (20/32 Snellen)	0.0 (20/20 Snellen)	1.0 (20/200 Snellen)	0.2 (20/32 Snellen)	0.0 (20/20 Snellen)	0.0 (20/20 Snellen)
CDVA	0.05 (20/25 Snellen)	0.0 (20/20 Snellen)	1.0 (20/200 Snellen)	0.1 (20/25 Snellen)	0.0 (20/20 Snellen)	0.0 (20/20 Snellen)
UNVA	1.0 (20/200 Snellen)	0.1 (20/25 Snellen)	0.5 (20/63 Snellen)	0.3 (20/40 Snellen)	0.3 (20/40 Snellen)	-0.10 (20/16 Snellen)

UDVA: Uncorrected distance visual acuity (5 m); CDVA: Corrected distance visual acuity (5 m); UNVA: Uncorrected near visual acuity (40 cm).

DISCUSSION

We speculated the reasons for deterioration of postoperative visual quality, such as postoperative inflammation which could lead to proliferation of lens epithelial cells and migration to the anterior surface of IOL, and even corneal endothelial edema and opacity of refractive media. The unique functional and structural characteristics of glaucoma patients lead to an increased risk of PCO, inflammation, and anterior capsular opacification[6-8]. Above all, although the patient’s eyesight reflected well numerically, when we repeatedly confirmed her subjective experience on the first day postoperatively, there was no inflammatory reaction and no proliferation of lens epithelial cells, and the patient emphasized that she felt clearly in near vision while obscurely in distant vision. Consequently, we conjectured that lens position might play a key role. Given that the lens was a plate-haptic design for excellent stability, it will be more difficult to rotate it later. Meanwhile, anterior capsule polishing is a method to prevent the occurrence of PCO and enhance visual function[9]. Here, we decided to perform surgery for polishing capsule and repositioning the IOL in the same operation, trying to enhance the patient's visual quality and reduce the patient’s complaints and pain.

Why did we choose to rotate the near segment to the superotemporal position rather than somewhere else? SBL-3, as mentioned in this case, is designed based on the concept of asymmetric regional refraction, and the choice of its placement position appears to be particularly important. A study by de Wit et al[10] found that the difference between inferonasal near add positioning and superotemporal near add positioning was not statistically significant. What’s more, whether the near segment is positioned inferiorly, superiorly, or temporally, there was no significant effect on visual performance[11]. A study by McNeely et al[5] found that bilateral implantation of asymmetric multifocal IOLs with a combination of superotemporal placement of the near segment in the dominant eye and inferonasal placement of the near segment in the fellow eye enhanced quality of vision and reduced symptoms such as glare and halo compared with bilateral inferonasal placement. In our case, we chose to shift the near segment to the superotemporal position in the dominant eye (Figure 3); coincidentally, the near segment of the lens of the fellow eye was positioned inferonasally. The patient’s satisfactory postoperative results confirmed the feasibility of the mix and match placement scheme.

Figure 3 Slit lamp examinations 1 yr after phacoemulsification in the left eye. A: The intraocular lens (IOL) with the near segment placed superotemporally the first day after rotation in the left eye (blue: near segment; green: distant segment); B: The IOL with the near segment placed superotemporally one year after rotation in the left eye; C: The IOL with the near segment placed inferiorly with slight nasal deviation half a year after phacomulsification in the right eye.

Because of its asymmetrical design, tilt and decentration had a prominent effect on optical quality with the rotational asymmetric multifocal IOL in vitro. Liu et al[12] found that the decentration induced increased or decreased optical quality, but tilt yielded decreased optical quality at different orientations. Pazo et al[13] also demonstrated that rotation of the asymmetric IOL can be used to both recenter the IOL and increase the required surface area of either distance or near component within the physiological pupil, thereby optimizing visual outcomes. These are all important considerations when using this asymmetric multifocal IOL.

There has been considerable debate over whether multifocal IOL implantation is a suitable choice for glaucoma patients. Studies have shown that glaucoma patients can benefit from multifocal IOL technology and achieve spectacle independence with no significant adverse effects[14]. Use of these IOLs in the presence of concurrent eye diseases has not been extensively studied. Thus, decisions regarding the choice of a multifocal IOL in patients with glaucoma must be made on an individual basis, with patient motivation and expectation being a prime mover. The rate of progression of glaucoma in an individual patient is also an important consideration[15].

CONCLUSION

The postoperative inflammatory reaction and lens epithelial cell proliferation were obvious in this glaucoma patient. Capsule polishing and rotation of the lens were beneficial to the patient, which not only enhanced the patient's vision, but also improved the patient's satisfaction. Glaucoma patients need to be cautious of implanting multifocal IOLs. Placement of a near segment of an asymmetrical multifocal IOL in the dominant eye should be performed on an individual basis. Although cataract surgery for glaucoma patients may be challenging, it affords an opportunity to dramatically improve the quality of life of patients.