Line spacing (the gap between lines of text) is vital for assisting readers in moving from one line of text to the next without skipping a line or ending up on the previous line read. 30pt to 34pt is the appropriate amount of spacing between paragraphs. Less than this and the reader can end up with neck pain due to having to bend their head too far back; more than this and they may feel overwhelmed by the text. Without proper line spacing, the reader would have to strain their eyes to see each line of text. This could lead to eye strain and headaches. It's best to leave at least an inch between lines of text. For the first two sentences, there is no space between them. For the third sentence, there is about a quarter of an inch of space between it and the next sentence. The fourth sentence has been separated from the others by a full inch so that readers do not have to strain themselves to read it. This article is mainly concerned with the amount of space between lines of text in paragraphs. However, the term "line spacing" is also used to describe the distance between items such as words in lists, photographs, and drawings. This is often called "lettering" when applied to typeface design. The correct amount of line spacing depends on several factors.