Hyperopia: The anterior chamber depth and volume are smaller in hyperopic eyes. These include shallow central anterior chamber depth (ACD), thick lens, anterior lens position, small corneal diameter and radius of curvature, and short axial length. Pen Torch method: Shine a pen torch into the pt’s eye from the temporal canthus such that the pen torch lies in the same plane of eye. The angle of the anterior chamber can vary. In such eyes, the iris can bunch up as the pupil dilates and close off the angle. In the case of a deep anterior chamber, the iris lies flat and the whole iris will be illuminated. In the case of a very shallow anterior chamber the iris lies forward, blocking some of the light and very little of the iris is illuminated. The shorter eye of a hyperope is more likely to be shallow. the eye. Estimating the depth of the anterior chamber is an important aspect of the slit lamp exam. If the chamber is deep, angle closure is unlikely to occur. Although slit-lamp gonioscopy is considered the gold-standard technique for ACA evaluation … The liquid (called aqueous) flows along the back of your iris, through your pupil (the dark centre of your eye) and into your anterior chamber. Most people have what is called an “open angle” meaning the aqueous can flow freely through the chamber. Some people have a shallow anterior chamber, narrowing the angle of the eye. In the case of a deep anterior chamber, the iris lies flat and the whole iris will be illuminated. Therefore, the refractive status of a patient with a shallow anterior chamber and a short AL would trend towards a myopic shift, conversely, a deep anterior chamber and long AL would move toward a hyperopic shift. In some people the chamber may be narrow or blocked. The physician can make a definitive diagnosis of plateau iris by performing a peripheral laser iridotomy and then re-evaluating the patient. Taken together, the shallower the anterior chamber and the shorter the AL were, the greater were the changes in the ACD. Aqueous misdirection is a challenging form of secondary angle closure that presents with elevated intraocular pressure (IOP) and shallowing of the central and peripheral anterior chamber despite the presence of a peripheral iridotomy. Assessment of the anterior chamber angle (ACA) is an essential part of the ophthalmological examination. The iris can sometimes close the angle by dilating in … Anterior Chamber Intraocular Lens Placement Technique: A Tutorial. In this situation, the iris should be raised from the capsule to even out the pressure; the chamber depth will then return to normal. As a cataract surgeon, there are a handful of skills which are infrequently encountered, but … The front part of the eye houses the anterior chamber. It is intrinsically related to the diagnosis and treatment of glaucoma and has a role in its prevention. Based on the amount of eye illuminated the … P. Christi Carter, MD, Thomas A. Oetting, MS, MD Submitted July 5, 2016 "Just-in-Case" Situations. 5 Highly myopic patients have a wide angle, which facilitates instrument entry. Shallow peripheral anterior chamber: Having smaller anterior segment dimensions is the main ocular risk factor for closure of the angle, with anterior chamber depth having the … The change in ACD was significantly larger in the shallow anterior chamber than the deep chamber. To help identify plateau iris, note if the chamber is deep centrally and shallow peripherally, rather than uniformly shallow as in chronic narrow-angle glaucoma. A deep anterior chamber may be caused by a ‘reverse pupil block’. Myopes, with their longer eyeballs, generally have a deep anterior chamber. However, the nucleus can be very large and the chamber deep.
