However, a small magnitude or intermittent strabismus can easily be missed upon casual observation. In any case, an eye care professional can conduct various tests, such as cover testing, to determine the full extent of the strabismus. Symptoms of strabismus include double vision and/or eye strain. To avoid double vision, the brain may adapt by ignoring one eye. In this case, often no noticeable symptoms are seen other than a minor loss of depth perception.
About trade unions. Trade unions are groups of employees who join together to maintain and improve their conditions of employment. The typical activities of a trade union include providing assistance and services to their members, collectively bargaining for better pay and conditions for all workers, working to improve the quality of public services, political campaigning and industrial action.
Also known as a labor union, labor organization, collective bargaining unit or, simply, a union. At common law, a trade union was much like a general partnership, the trade union having no legal person distinct from the members. Membership was voluntary and the members were the union. In contemporary labour law, trade unions have separate legal personality from their members. A union may own property, sue and be sued - just like a corporation. 1