ocular response analyser disadvantages
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.•♫•♬• Response Analyzer
Until recently, corneal biomechanical properties could not be measured in vivo. The ocular response analyzer is a new, noninvasive device that analyses corneal biomechanical properties simply and rapidly. The ORA allows cornea compensated IOP measurements and can estimate corneal hysteresis (CH) and corneal resistance factor (CRF). It is designed to improve the accuracy of IOP measurement by using corneal biomechanical data to calculate a biomechanically adjusted estimate of intraocular pressure. This review critically evaluates the technology and its implications in current day glaucoma management.
Keywords: Hysteresis, Ocular response analyser, Corneal biomechanics, Tonometry.
INTRODUCTION
Glaucoma is one of the leading causes of visual impairment and blindness worldwide.1-3 Lowering intraocular pressure (IOP) is the only proven means to slow or halt disease progression, as shown by studies of those at high risk of developing glaucoma [ocular hypertension treatment study (OHTS)],4 those with early to moderate glaucoma [collaborative initial glaucoma treatment study5 and early manifest glaucoma trial (EMGT)]6 and those with more advanced glaucoma [collaborative initial normal-tension glaucoma study7 and advanced glaucoma intervention study (AGIS)].8 Across all randomized, controlled trials, lowering IOP resulted in reduction in rates of worsening of glaucoma over 5 years.8,9 These studies confirm that one of the pathophysiological basis for glaucoma is elevated IOP.•♬•♫•.
Disadvantages of the Ocular Response Analyser as a Measuring Tool It is not possible to getrepeatable and accurate measurement in eyes with poor fixation and those with nystagmus.It is difficult to do the procedure in children and uncooperative patients