The first thing to do is get together all your loose coins. Empty out your pockets, purse, wallet or anywhere else you keep coins. Spread them out on a flat surface so all the coins are visible are none of them are overlapping each other. You want to be able to distinguish each coin easily. Next, you can split the coins up into groups determined by their value. For example, scoop together all the nickels in one place, all the dimes in another, and so on. Do this until you have little piles of each coin. Then stack up the coins from each pile into a column. Once you've done this you should have a collection of little stacks of coins on the table.  The size and color of the coins makes this easy to do very quickly. You could do this in descending order from a high value to low by first stacking all your dollar coins together in one pile, followed by your quarters, dimes, nickels and, finally, pennies. Now work your way through the stacks calculating the value of each one and noting it down. For example, if you have a stack of ten 1 cent coins note down that that stack's value is 10 cents. Five 50 cents coins? Write down $2.50. Complete this calculation for each stack.  You could also write it down on a tally chart. With headings for each coin denomination, you can tick for each coin you have of that value and then add up the totals. If you have a lot of stacks you will need to clearly identify which ones you have already counted. You can do this just by moving them to one side when they are counted. For example, keep uncounted stacks on your right-hand side and slide them over to your left when they are counted. Once you know the value of each stack you just need to add them all together to get the total. You can add that up as you go and keep a running total to make it quicker. If you think you might forget, writing the value of each stack means you can go back and add it all up together at the end. If you have a lot of coins or regularly need to process a lot of change for your job, it might be a good idea to get hold of a coin sorting machine. These are devices which sort your coins for you by denomination. Some of the more advanced machines will also count them and tell you the total value.  You may find coin counting machines in your bank or store which you can use. But be aware that there will typically be a charge for this service. The most common coin-counting machines in the US generally cost a fee of around 10% of the total value of the change you process.
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One-sentence summary -- Gather together all your coins. Organize by size and value. Calculate the value of each stack. Add it all together. Consider using a coin sorting machine.

Article: Nearsightedness makes it difficult to see objects far away. This is caused by having an eyeball that is too long, or a cornea that is too curved. This affects the way light is reflected on the retina, which causes blurred vision. Farsightedness makes it difficult to see objects that are up close. This is caused by having an eyeball that is too short, or a cornea that is not curved enough. An Astigmatism is when the eye doesn’t focus light properly into the retina. Astigmatism causes objects to appear blurry and stretched out. It is caused by an irregular shaped cornea. This condition typically comes with age (over 40). This condition makes it difficult for the eye to focus on objects clearly. Presbyopia is caused by a loss of flexibility and thickening of the lens inside the eye.
Question: What is a summary of what this article is about?
Identify nearsightedness. Identify farsightedness. Identify astigmatism. Identify presbyopia.