visual blurring

the sensation resulting from impairment of the ability to perceive form in the central field region, which is typically associated with poor visual acuity and reduced spatial contrast sensitivity. Visual blurring can occur as a result of retinal disease (e.g., macular degeneration, diabetic retinopathy) or damage to the optic nerve (e.g., associated with multiple sclerosis) or visual cortex; it has also been reported as a side effect of anticholinergic drugs and as a consequence of accommodative spasm. Patients experience difficulties with reading and face perception (especially in black-and-white photographs).

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Psychology term of the day

December 18th 2024

homeostasis

1. the regulation by an organism of all aspects of its internal environment, including body temperature, salt–water balance (see osmoregulation), acid–base balance (see hydrogen-ion concentration), and blood sugar level. This involves monitoring changes in the external and internal environments by means of receptors and adjusting bodily processes accordingly. Compare tension law. [first described by Walter B. Cannon]

2. maintenance of a stable balance, evenness, or symmetry. —homeostatic adj.