Pseudophakic ametropia management with toric implantable collamer lens with a central hole (case report)
© The Author(s). 2017
Received: 17 November 2016
Accepted: 17 February 2017
Published: 21 February 2017
To report the clinical outcomes of correcting pseudophakic ametropia using toric implantable collamer lens with a 360 um central hole (TICL V4c).
The right eye of a 22-year-old male patient developed high myopia after unilateral phacoemulsification and intraocular lens (IOL) implantation following traumatic cataract 16 years ago. The manifest refraction was -11.50 DS/-2.50 DC × 175 with an uncorrected distance visual acuity (UDVA) of 20/2000 and a corrected distance visual acuity (CDVA) of 20/20. The manifest refraction of left eye was -6.25 DS/-3.75 DC × 180 with UDVA 20/200 and CDVA 20/20. Both eyes were implanted posterior chamber TICL V4c lens. Postoperatively, the refractive errors were +1.00 DS/-0.50 DC × 50 with UDVA 20/16 and CDVA 20/16 in the right eye and +0.75 DS/-0.75 DC × 45 with UDVA 20/16 and CDVA 20/13 in the left eye, respectively. No complications were observed.
TICL V4c is safe, effective and predictable in managing pseudophakic ametropia.
KeywordsImplantable collamer lens TICL V4c Pseudophakic ametropia Case report
Pseudophakic ametropia can be corrected by spectacles, contact lenses, intraocular lens (IOL) supplementation or exchange [1, 2], and corneal refractive surgeries [3, 4]. Spectacles offer an inconvenient approach and contact lenses have potential risks of dry eye and infectious keratitis. IOL exchange is a difficult option with potential complications of capsule tear, vitreous loss, and retinal detachment, especially if the lens is adherent to the capsular bag . Corneal refractive surgeries can be used to correct lower amount of refractive errors when corneal thickness is in the safe range, but corneal scarring or haze, flap complications and regression may be the complications [3, 4]. In cases of higher refractive errors, the new posterior chamber implantable collamer lens (ICL V4c) provides an alternative approach, as corneal thickness may not meet the requirements of large refractive corrections. The new 360 μm central hole design of ICL V4c allows for the natural flow of aqueous humor without the need for a peripheral iridotomy . This study investigates the clinical outcomes of correcting high myopia of a young adult in the management of pseudophakic ametropia using TICL V4c.
-11.50/-2.50 × 175
43.1/45.8 × 172.8
-6.25/-3.75 × 180
43.2/46.8 × 172.0
The medications used 3 days before surgery were the same as the standard implantation of the lens [6, 7]. After cycloplegic agents (1% Tropicamide, Alcon, Belgium) and topical anaesthesia (0.4% Oxybuprocaine hydrochloride, Santen, Japan), the visco surgical device (Provisc, Alcon, Belgium) was placed into the anterior chamber and synechiolysis of pupil was performed with surgical scissors carefully, then the implantation of ICL and the remaining procedure were the same as our previous studies [6, 7].
43.3/45.2 × 165.3
41.1/46.8 × 179.1
+1.00/-0.50 × 45
43.5/45.5 × 165.6
+0.50/-0.75 × 30
42.1/46.0 × 174.0
+1.25/-0.75 × 45
43.3/45.8 × 173.6
+0.50/-0.75 × 30
42.1/46.2 × 173.7
+1.00/-0.5 × 50
43.3/45.4 × 170.1
+0.75/-0.75 × 45
42.2/45.9 × 171.3
Patients’ desire and their corneal conditions determine the options for correction of a refractive error. This patient had an urgent desire to get rid of the spectacles. Corneal refractive surgery is not an appropriate surgical correction for this patient because of his thin cornea. Lens replacement, on the other hand, is a difficult and risky surgical option because it has been a long time since the primary operation and that oval pupil with pupillary margin adhesion has been formed. Under the circumstances, ICL implantation has become the most appropriate choice.
Intraocular lens exchange for the correction of pseudophakic ametropia is feasible if the surgery is performed early. It would be difficult to replace an IOL into the bag, if anterior and posterior lens capsules were adhered to each other after a long-term primary surgery. Once the capsule shrinks around the IOL, complications such as capsule tear, vitreous loss, and retinal detachment may occur .
Corneal refractive surgery such as laser-assisted subepithelial keratomileusis (LASEK), laser-assisted in situ keratomileusis (LASIK) and small incision lenticule extraction (SMILE) is an option to correct pseudophakic ametropia [3, 4]. The procedures are irreversible and the incidence of complications such as flap complications and regression is well known. Lots of studies [8–10] report the ICL as a more favorable option than corneal refractive surgery in terms of higher stability and visual quality and its superior performance on dry eyes.
Implantation of supplementary lens for the correction of residual refractive error in pseudophakic eye is another option. Anterior chamber IOLs may cause endothelial cell loss and need a larger incision for insertion, as well as problems with pupil ovaling . The technique of implanting 2 IOLs in the posterior chamber was described as “piggyback”, the traditional piggyback referred to that a conventional in-the-bag IOL was implanted in pseudophakic eye, which may cause interlenticular opacities because two IOL optics are placed close to each other [1, 12, 13]. Postoperatively, there were risks of intraocular pressure increase, IOL shift and pupil capture [12–14]. ICL compare favorably with IOL as the enough vault between the ICL and the primary IOL may contribute to decreasing the opacity [15–18]. Also, Toric ICL can correct the astigmatism. However, inappropriate ICL may cause TICL rotation or positioning error in pseudophakic eyes which can bring new astigmatism. Patients with severe vision loss or ghost after TICL rotation need adjustment of TICL position. The previous ICL V4 has a risk of postoperative intraocular pressure increase. At present, the ICL V4c decreases the rate of opacity and intraocular pressure increase without peripheral iridotomy for the central hole design . Besides, pupil capture rarely occurs as the ICL haptics were placed in the ciliary sulcus. The accuracy of ICL is higher, because the calculation of ICL mainly depends on refraction, while the calculation of IOL mainly depends on the biometry parameters.
The option of ICL size is a problem for pseudophakic eyes. Both the ICL length evaluation and the power calculation were originally designed for phakic eyes, and it hasn’t been affirmed whether ICL would introduce significant error in pseudophakic eyes. Fortunately, the other phakic eye has not been implanted IOL and crystalline lens were reserved, and the parameters of the pseudophakic eye were similar with phakic eye except ACD. Therefore, the selection of ICL size in phakic eye was a reference to pseudophakic eye. Postoperatively, the ideal vault of both eyes was obtained. In the Takashi Kojima’s report , size of the ICL was chosen based on WTW and ACD, 6 eyes (75%) showed high vault (>3/2CT) after surgery, but scheimpflug image evaluation showed that the angle was open and the postoperative intraocular pressure was normal in these eyes with high vault. We believe that accurate ciliary sulcus diameter measured by UBM is necessary for the selection of ICL size. In general, the ACD of pseudophakic eye is far deeper than the phakic eye because the anterior surface of an IOL is situated further back in a pseudophakic situation than the that of the crystalline lens in a phakic situation. We advise that the ACD of phakic eye population may be a reference when choosing the size of ICL in pseudophakic eye if there was not a referable contralateral phakic eye.
Our case suggests that TICL V4c is safe, effective and predictable in managing pseudophakic ametropia.
Anterior chamber depth
Central corneal thickness
Corrected distance visual acuity
Endothelial cell density
Horizontal sulcus to sulcus
Implantable collamer lens
Laser-assisted subepithelial keratomileusis
Laser-assisted in situ keratomileusis
Small incision lenticule extraction
Sulcus to sulcus
Toric implantable collamer lens
Uncorrected distance visual acuity
Vertical sulcus to sulcus
We adhered to the CARE guidelines/methodology.
This research was supported by the Committee of Science and Technology of Shanghai, China (Grant No. 09411962100), the Health and Family Planning Committee of Pudong New District of Shanghai, China (Grant No. PW2014D-1).
Availability of data and materials
Data and materials are available upon request from the corresponding author at email@example.com.
Literature screening and selection was performed by XC. XW and XZ collected and interpreted the data. XC carried out the statistical analysis. XC drafted the manuscript. XW and XZ revised and reviewed of the manuscript. XC, XW and XZ gave final approval of the version to be published. All authors have read and approved it for publication.
The authors declare that they have no competing interests.
Consent for publication
Written informed consent was obtained from the patient for publication of this case report and any accompanying images.
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