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Tape. Pin, paperclip or pencil. Cut a small hole in the middle of one of the pieces of paper, then tape a piece of aluminum foil over the hole. Use the pin, paperclip or pencil to poke a hole in ...
Cut a square hole on one end of the box and tape the foil over it. Poke a small hole in the foil. On the opposite side, tape a piece of paper inside the box. Once its ready, turn your back to the ...
Cover one eye; read the letters aloud. Cover the other eye; read the letters aloud. Ah, the standard eye exam. A few lines of text and the doctor can tell you whether you have poor vision.
Synesthesia. A person with synesthesia may associate certain letters and numbers with certain colors. Most synesthetes see characters just as others do (in whichever color actually displayed) but they may simultaneously perceive colors as associated with or evoked by each one. Synesthesia ( American English) or synaesthesia ( British English ...
Solar viewers (also known as solar viewing glasses or solar eclipse glasses) are special eyewear designed for direct viewing of the Sun. Standard sunglasses are unable to filter out eye damaging radiation. Solar viewers can be used for safe viewing of solar events such as eclipses. The recommended optical density of this eyewear is 5, meaning ...
Pupillary distance. Monocular PD can be measured during an eye test. Pupillary distance ( PD ), more correctly known as interpupillary distance ( IPD) is the distance in millimeters between the centers of each pupil. [1]