People with a certain eye disorder are virtually unable to see in moderately bright light, which seems to them unbearably intens
e, since the cells of their retinas are overwhelmed by moderately bright light. These people do, however, show normal sensitivity to most components of dim light. Their retinal cells are also not excessively sensitive to red components of moderately bright light. The information above best supports which of the following hypotheses about people with the disorder described, if they have no other serious visual problems? A. In all moderately dim light in which people without the disorder can read large print, people with the disorder cannot read such print. B. In an otherwise darkened concert hall, these people will see a dimly illuminated red exit sign more clearly than small dim white lights that mark the aisles. C. These people typically see more acutely at night and in dim light than do most people who do not have the disorder. D. Eyeglasses that are transparent to red components of light but filter out other components of light help these people see in moderately bright light. E. These people perceive colors other than red in the same way as do most people who do not have the disorder
D. Eyeglasses that are transparent to red components of light but filter out other components of light help these people see in moderately bright light.
Explanation:
The eye disorder that makes people virtually unable to see in moderately bright light is called photophobia. Ocular photophobia, sensitivity or intolerance to light may be due to various eye diseases, or may result only from a greater "impression" or "irritation" with light by certain people, being more common in individuals of clear eyes.
Severe photophobia rarely manifests in normal eyes if there is no underlying disease. In rare cases people with enlarged pupils (large pupils) may experience greater sensitivity to light, as the larger the pupil the more light will reach the retina. However, wearing glasses that are transparent to red light components, but which filter out other light components, can help these people see with moderately bright light.
Epidural and Spinal Anesthesia. Epidural anesthesia is administered by injecting local anesthetic into the epidural space and can be performed in the sacral hiatus or in the lumbar, thoracic, or cervical regions of the spine. Spinal anesthesia follows the injection of local anesthetic into the CSF in the lumbar space.
