Visibility of colors underwater using artificial illumination.
The visibility of various colors underwater with artificial illumination has been measured in three different bodies of water chosen to sample a continuum from clear to turbid. Subjects were Scuba divers who observed the colors at night, using a mercury or an incandescent light source. The visibility results show numerous interactions among color, fluorescence, type of light source, and type of water; from them, it is possible to select the optimum combination to be used under a wide variety of conditions.
Judgments Of The Visibility Of Colors Made From An Underwater Habitat.
Abstract : Judgments of the relative visibility of colors were made during the 'La Chalupa' dive from the habitat located in 100 ft of Caribbean water. Judgments made with colored targets viewed against the water background were in agreement with previous studies; that is, bright colors were the easiest to see and dark colors disappeared the most readily. However, when the colors were viewed against a light gray background, dark colors were the nost visible. It appears that negative contrast under water is superior to positive contrast of the same amount. In addition, small diurnal changes were found with green increasing in visibility and orange decreasing as the day wore on.
Solitary Orbital Paget Disease: A Case Report
Purpose: To describe the clinical findings in a patient who had developed painless supraorbital prominence. Methods: Clinical and histopathological findings of the case are reviewed and presented. Results: The patient had an isolated histologically confirmed Paget disease of the orbit. Local excision of the lesion was performed. Conclusion: Paget disease can present not only as a diffuse process but also as a painless, solitary lesion of the orbit.