Surgical technique for management of isolated lenticular coloboma with high corneal astigmatism

Implantable Collamer Lens Subluxation in a Patient with Lenticular Coloboma: A Case Report

BACKGROUND The efficacy and safety of the implantable collamer lens (ICL) in correcting high astigmatism have been previously reported. They are commonly used as an alternative to laser refractive surgery due to advantages such as leaving the cornea untouched, inducing fewer higher-order aberrations, resulting in better optical and visual quality, and it is a reversible procedure. We aim to present the outcome of ICL in managing anisometropia without cataract in an eye with unilateral lenticular coloboma. CASE REPORT A 27-year-old man with a Marfanoid body habitus was seeking refractive surgery for the correction of high astigmatism in the right eye. On presentation, the best corrected visual acuity was 20/30 and 20/20 in the right eye and left eye, respectively. Slit lamp examination indicated inferior lens coloboma extending from the 5 o'clock to the 7: 30 o'clock position in the right eye, after dilation of pupil. Following a complete refractive work-up, a toric ICL implantation was the presumed suitable surgery. Three weeks postoperatively, central vaulting was low, his ICL subluxated inferiorly, and the previously implanted temporal footplates were resting over the lenticular defect inferiorly. A high-resolution ultrasound biomicroscopy confirmed the presence of a ciliary body (CB) cyst at 9 o'clock position. Urgent explantation of the unstable ICL was performed. CONCLUSIONS This case report emphasizes the challenges and limitations associated with ICL implantation in patients with lenticular colobomas and coexisting CB cyst. Selecting smaller lenticular colobomas and avoiding direct interaction between the weak zonules area and the ICL haptics are important steps to ensure the stability of implanted lens.

Evidence on reporting guidelines for surgical technique in clinical disciplines: a scoping review protocol

Background

The reporting of surgical techniques is of mixed quality, with most at a very minimal level. Reporting guidelines that could be applied to guide surgical technique reporting vary in methodology for development, discipline coverage, dimension coverage and detail requested. However, a scoping review that could indicate the gaps and efforts needed in surgical technique reporting guidelines is lacking and warranted. This study aims to design a methodological rigour protocol to guide the development of a scoping review of surgical technique reporting guidelines.

Methods

This protocol is designed following the 2020 manual proposed by the Joanna Briggs Institute. To further ensure the soundness of the protocol, we also included multidisciplinary professionals (including methodologists, clinicians, and journal editors) to refine the protocol.

Discussion

Seven key steps for developing the scoping review are identified and presented in detail, including (I) identifying the research questions; (II) inclusion criteria; (III) search strategy; (IV) source of evidence selection; (V) data extraction; (VI) analysis of the evidence; and (VII) presentation of the results. Guided by this protocol, the subsequent scoping review will inform us the overview of surgical technique reporting guidelines and precisely guide our direction and next steps in improving surgical technique reporting guidelines.

Trial registration

This protocol is not registered as the PROSPERO database only accepts registration of systematic review protocols while does not accept registration of scoping review protocols.

Optical changes and apparent emmetropization in a patient with a peripheral unilateral lens coloboma

Lens coloboma is a developmental defect resulting from abnormalities of the zonules and ciliary body. It may present as an isolated pathology or be accompanied by anomalies in different ocular structures. We report the case of a 20-year-old man referred for evaluation of anisometropic amblyopia in the right eye. Manifest refraction was -2.25 +3.00 ×35 in the right eye; corrected distance visual acuity, 20/50. Corneal topography revealed regular astigmatism of +2.46 D at 124°, and wavefront aberrometry revealed an irregular internal astigmatism of +6.27 D at 35°. Only after full pupillary dilation was a peripheral lens coloboma observed. This case demonstrates that even minor distortions of clear and normally positioned lenses may lead to amblyopia and raises the possibility that corneal changes may occur developmentally through the process of emmetropization partly to compensate for lenticular astigmatism arising from the coloboma.

An update on the genetics of ocular coloboma

Ocular coloboma is an uncommon, but often severe, sight-threatening condition that can be identified from birth. This congenital anomaly is thought to be caused by maldevelopment of optic fissure closure during early eye morphogenesis. It has been causally linked to both inherited (genetic) and environmental influences. In particular, as a consequence of work to identify genetic causes of coloboma, new molecular pathways that control optic fissure closure have now been identified. Many more regulatory mechanisms still await better understanding to inform on the development of potential therapies for patients with this malformation. This review provides an update of known coloboma genes, the pathways they influence and how best to manage the condition. In the age of precision medicine, determining the underlying genetic cause in any given patient is of high importance.