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double-blind procedure-an experimental procedure in which neither the subjects of the experiment nor the persons administering the experiment know the critical aspects of the experiment; a double-blind procedure is used to guard against both experimenter bias and placebo effects.ouble-blind procedure-an experimental procedure in which neither the subjects of the experiment nor the persons administering the experiment know the critical aspects of the experiment; a double-blind procedure is used to guard against both experimenter bias and placebo effects.
Problems with them can lead to double vision: Multiple sclerosis can affect nerves anywhere in your brain or spinal cord. If it damages the nerves that control your eyes, you may see double. Guillain-Barre syndrome is a nerve condition that causes progressive weakness. Sometimes, the first symptoms are in your eyes and include double vision. Diabetes can cause nerve damage to the muscles that move your eyes. That can lead to double vision. Brain: The nerves that control your eyes connect directly to your brain, where images are processed. Many causes of double vision start in the brain. They include: Strokes; Aneurysms