Problem: Article: A topographer is a newer version of the keratometer. Your doctor will have you sit at a table and look into a bowl. This bowl's inner surface is covered in a pattern of concentric rings. A digital camera sits at the base of the bowl and charts the cornea's surface by measuring the reflected pattern in the eye. This basically creates a contour map of your eye, and it’s an excellent technique for measuring irregular astigmatism.  Most corneal topography tests measure 8,000 to 10,000 points on the cornea, making it the most accurate keratometry test. Other advanced ways of measuring astigmatism include autorefractors that measure refraction, and the IOLMaster that makes extensive measurements of the interior and exterior of the eye. The IOLMaster is usually used before cataract surgery. The Placido disc is an old-fashioned, hand-held device that is shaped like a giant lollipop. The disc has several sets of concentric circles painted on one side, and is used to measure the regularity of your cornea’s surface. Your doctor holds the disc up to their own eye with the rings pointed towards you, and they look into your eye. Sit still and look straight ahead. The image of your cornea reflects back, and where there is irregular shape it makes the concentric rings look distorted to your doctor. This old-fashioned method can help to diagnose keratoconus, a disorder that causes irregular astigmatism due to thinning and protruding of the cornea. The shape of your posterior cornea (the back surface of the cornea) can influence the severity of your astigmatism. Keratometry can only measure the front of your cornea, but Scheimpflug imaging uses tomography to get more accurate readings of how thick your cornea is and what the back of it looks like. This method can be helpful in predicting how successful surgery may be in correcting your astigmatism.
Summary: Use a corneal topographer for more precise measurements. Try a Placido disc for irregular astigmatism. Use a Scheimpflug device to measure the posterior cornea.

INPUT ARTICLE: Article: Insert a pitchfork into the soil you are planning to collect your worms from. Again, remember that worms thrive in dirt that is moist, and nutrient-rich, with plants and crops nearby and with mulch covering the soil. Make sure the majority of the fork tenors are in the ground. Rock the pitchfork back and forth in a constant rhythm, almost wiggling the pitchfork in place. Worms will start to surface from the dirt. This process may take a few minutes, so patience is key. Use your fingers to pick up the surfaced worms. They will be scattered, but be sure to maintain the rocking rhythm of the pitchfork. Keep your collected worms in a container with a perforated lid. The container should also have some dirt from which the worms can from, or some commercial worm bedding. Keep the worms in a dark and cool place until you are ready to use them.

SUMMARY: Stick a pitchfork into the ground. Rock the pitchfork back and forth. Gather the worms. Store the worms.

In one sentence, describe what the following article is about: If you're not automatically logged in, log in with your Facebook account. You will have to enter your email or phone number and your password. Your name and a thumbnail of your profile picture will be at the top of the navigation menu towards the upper-left corner of your Home page. Clicking on this button will take you to your Profile. A pencil icon will appear next to it. This is the Edit button. You will begin editing your Intro. Think about how you want to introduce your profile to visitors, and type in an Intro statement for yourself. This button will be right below the Intro text field, and it will save the changes to your Intro.
Summary:
Open Facebook.com in a web browser. Click on your name on the left navigation menu. Hover over your current Intro. Click the pencil icon. Edit your Intro. Click Save.