The following screenshot displays the Column Permissions settings page:

This settings page allows you to create column permission rules, each rule hides, shows or deactivate a selected field. 
After you have configured your rules and saved them, these rules will be processed according to their order every time a list form (New, Edit, View) is loaded, and each time a user makes selections in the form.

To setup a column permissions rules:

Select a column that you wish to hide/deactivate/show in the “Select a column” drop-down:

Create a new rule by clicking the “new rule” link:

A new rule definition section will appear:

To setup a rule:

• Select the list forms to which this rule should be applied:
  
  
  
  COMMENT:
  Here you can also choose “list views” if you want to apply a rule to all list views 
  (example: hide a column from all list views).

• Select the permission type:
  
  

• Setup conditions. These conditions define when the column permission should be applied. 
  You can create several conditions as you can see in the following screenshot:
  
  
  
  

IMPORTANT: 
If a rule is applied to list views, then the conditions can include only the item's content type and the current user.
You cannot use other columns in the condition (they are all grayed out).

After you save the rule by clicking “Apply” or “Save” this rule will appear below the “All Rules” section:

To edit an existing rule, simply click the “Edit” link appearing on the left side of each existing rule.