Observation of Peripheral Retina by Topical Endoscopic Imaging Method—A Preliminary Study

Abstract

IntroductionThis study evaluated the usefulness of rigid endoscopy placed on the corneal surface to observe the peripheral retina.MethodsThe authors studied 15 eyes in 15 patients (12 men, 3 women; mean age 55.9 years; range 22–74 years) that underwent vitreous surgery at the Department of Ophthalmology at Saga University Hospital. With patients in a supine position, after topical anesthesia, an eye cup was placed between the eyelids and filled with hydroxyethyl cellulose solution and physiologic saline. With a rigid endoscope placed near the corneal surface, the target areas were then observed and recorded. The usefulness of rigid endoscopy to observe the peripheral retina was evaluated based on differences due to lens status and pupil size.ResultsIn seven aphakic eyes, irrespective of pupil size, the peripheral retina could be observed up to the entire ora serrata (all quadrants). In eight eyes implanted with an intraocular lens, the observable area changed with pupil size and anterior capsulorrhexis size.ConclusionThis technique using rigid endoscopy was simple to manipulate and useful for observing and recording the peripheral retina. In particular, in aphakic eyes, irrespective of pupil size, the retina could be observed to the ora serrata.

Smartphone wide-field fundus photography in retinoblastoma with a nasal endoscope

“…Alternative technologies for acquiring wide-field fundus images include smartphone-based indirect ophthalmoscopy and endoscopes and otoscope connected with a digital SLR camera. [ 1 2 3 ] Shanmugam et al . first demonstrated fundus photography using a nasal endoscope.…”

A Simple and Easy Method Using Rigid Endoscope to Detect Iridocorneal and Keratolenticular Adhesions in Peters' Anomaly

“…In the present cases, we employed the widely used otoscope to perform TEI. Utilization of this method makes it possible to easily visualize the anterior segment structure via a small clear area of the cornea [ 7 , 8 ]. When TEI was used to examine case 1, a small iridocorneal adhesion positioned toward the back of the corneal lesion was observed.…”

“…Therefore, this study demonstrates that TEI is a novel method that is capable of looking into an eye from only a small area of the clear cornea, although the image obtained with this system is a monocular image and its resolution is restricted by the performance of the charge-coupled device. In addition, this technique may also be helpful when investigating congenital abnormalities in the anterior chamber, angle, iris, and lens, especially in patients unable to remain in a sitting position [ 7 ].…”

“…Fundus examination showed a normal appearance of the OD and OS except for the superior periphery, which was difficult to observe because of the corneal opacity. Thus, to examine the anterior chamber in detail, we performed TEI with a previously reported method [ 7 , 8 ]. Briefly, the authors used a rigid endoscope with an otoscope 6.0 cm in length and an outer diameter of 4 mm (1215AA; Karl Storz, Tuttlingen, Germany) with a crescent-shaped illuminating tip.…”

“…However, without the patients’ cooperation, it can be difficult to obtain a desirable image when using this method. Topical endoscopic imaging (TEI) is a new tool that can be used to examine intraocular findings through a clear cornea [ 7 ]. Here, we present 2 cases that showed corneal opacity when examined by TEI.…”