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- What’s the TM when viewing the letter using 4X and 10X objective lens?As you view the wet mount of your cheek cell slide, it may appear to vibrate or shake. What could be the cause of this? O Your objective lens isn't clicked into place O You are using a solution of distilled water O You need to move up to a higher power objective lens O There is too much fluid between the coverslip and the slideWhat should be the distance between Mr. Saleto and the Snellen chart? 6ftaway What instructions can Casey give to Mr. Saleto if he uses glasses? By using the Snellen chart, is Cassey testing distance or near visual acuity? What does it mean if the result of the test is 20/60? What are some nonverbal cues that may indicate that the patient is having difficulty reading the line to which Cassey is pointing?