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 process by which the characteristics of a concept can be defined, including identification and classification. It consists of the methods or tests that are used in analyzing a given variable or concept, which can be used to confirm the validity of the information obtained. simple example that shows the relationship between a conceptual definition and an operational definition: if the concept is weight, an operational definition could be the weight of an object as measured on a scale.