Lazy eye usually does not cause any symptoms. Sometimes parents suspect vision problems because a child squints, looks cross-eyed, or holds his or her head in awkward positions to see things. In many cases, the problem is detected by a routine vision screening exam, either before or after a child starts school.
The procedures included in definitions should be repeatable by anyone or at least by peers. An example of operational definition of the term weight of an object, operationalized to a degree, would be the following: weight is the numbers that appear when that object is placed on a weighing scale.
An operational definition is a definition in which something is defined by that which comprises it. For example, a pie-eating competition is operationally defined as a competition in which one eats pies.(measured in the amount of pies eaten).perational definitions are also used to define system states in terms of a specific, publicly accessible process of preparation or validation testing, which is repeatable at will. For example, 100 degrees Celsius may be crudely defined by describing the process of heating water until it is observed to boil.