PubMed · 9261305
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M A Mainster, G T Timberlake, K A Warren, D H Sliney. 1997. Pointers on laser pointers.. https://doi.org/10.1016/s0161-6420(97)30156-0
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Intraocular medications, solutions, and instruments are an integral component of intraocular surgery. The ionic composition, pH, and osmolality should approximate aqueous humor to prevent damage to the corneal endothelium. Intraocular medications should be evaluated for their intrinsic properties and presence of vehicles or preservatives. Many new cleaning procedures and promising new intraocular drugs are likely to be introduced in the future. The responsibility of ocular surgeons is to protect their patients from drug-, solution-, or instrument-related toxicity.
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In four experiments on perceived object height and width, the effects of shifting participants' effective eye height (EEH) on affordance (intrinsic) and apparent size (extrinsic) judgments were contrasted. In Experiment 1, EEH shifts produced comparable overestimations of height in intrinsic and extrinsic tasks. A similar result was found with a more abstract extrinsic height task (Experiment 2). However, Experiment 3 revealed a dissociation between intrinsic and extrinsic tasks of perceived width. Affordance judgments were affected by EEH shifts, whereas apparent size judgments were not. Experiment 4 compared participants' performance on comparable extrinsic tasks of height and width. Height judgments were affected by EEH shifts, but width judgments were again unaffected. It is concluded that eye height may be a more natural metric for object height than for width. Moreover, this difference reflects a basic flexibility within the human visual system for selectively attuning to the most accessible sources of size information.