this is cereth is Turner's orange calm and in this video I'm going to show you how to assess visual acuity using a Snellen chart whenever you do this you're assessing cranial nerve 2 which is the optic nerve and of course whenever you perform the skill you will need a Snellen chart now we're going to test visual acuity using a Snellen chart and what you're gonna do is you're gonna have your patients and about 20 feet from the chart so Ben if you'll stand about right there for me and ask your patient do you wear glasses ok and if your patient does wear glasses you'll want them to wear those for this test ok so what we're gonna do look at that chart over there and try to read the lowest line for me that you can read ok and first we're gonna cover your right eye then your left eye and then we'll do both eyes ok so cover your right eye ok and what line can you read ok read it for me ok very good ok now we're going to cover up your left eye and do the same thing and again whatever line you can read let me know 8 again ok the C ok and now read with both eyes and what line ok ok and he read from line 8 so that means that he has 20/20 vision and this means that he can see the same line of letters at 20 feet that a person with normal vision can see at 20 feet however let's say that in his left eye he could only read like line 6 which is 2030 that would mean that his left eye sees at 20 feet that a person with normal vision would see at 30 okay so that is how you assess visual using a Snellen chart thank you so much for watching and don't forget to subscribe to our channel for more videos