The American Optometric Association suggests that children should have their first regular eye exam at six months of age. Another vision exam should take place when a child is around two or three years of age when their vision undergoes its most rapid development and vision correction is most effective.
The ISNUMBER function is a quick, easy way to check if a cell contains a number. Our example used the IF function to illustrate how ISNUMBER can be used. If you haven't used IF in a formula before, you can read our lesson on the IF function here.
If a cell contains a specific text than return a value Everywhere I search I see this formula for looking in a column and if a row contains a specific value then to return x, if not return y. =IF(ISNUMBER(SEARCH(text, A1)),X,Y) But when I use this in Excel 2010 I get an error. I modify it to look like this...