Amsler grid

Amsler grid

Laser Personnel Medical Surveillance

Published in D. C. Winburn, Practical Laser Safety, 2017

An Amsler grid or similar pattern is used to test macular function for distortions and scotomas. The test should be administered in a fashion to minimize malingering and false negatives. If any distortions or missing portions of the grid pattern are present, the test is not normal.

Conceptual design considerations for a wireless intraocular pressure sensor system for effective glaucoma management

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Journal Information

Published in Journal of Medical Engineering & Technology, 2019

Wolfgang Fink, Shaun Brown, Andres Nuncio Zuniga, Eui-Hyeok Yang, Thomas George

Using visual field loss as an indicator for glaucoma is largely inadequate in testing for and diagnosing glaucoma, since an impairment or decrease in one’s visual field is an indicator that irreversible glaucomatous damage to the eye has already occurred without the possibility for recovery. Preceding visual field loss, retinal ganglion cell atrophy and optic nerve fibre reduction are clinically detected in individuals who exhibit normal visual fields as assessed by perimetry [11], i.e., irreversible damage to the eye occurs before perimetry can psychophysically confirm the presence of visual field loss. Potential earlier detection of the onset of visual field loss in ocular hypertensives has been reported using a threshold Amsler Grid testing technology [12]. Moreover, it has been concluded that 40% to 50% of nerve fibres subject to glaucomatous atrophy can be lost in the absence of visual field defects [13,14]. Nevertheless, measuring IOP before observing the deleterious effects of its elevation reduces the potential for ocular damage in individuals with glaucoma, and allows for earlier treatment with improved clinical outcomes.

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Laser Personnel Medical Surveillance

Conceptual design considerations for a wireless intraocular pressure sensor system for effective glaucoma management