It is important for an engineer, particularly one who is involved in inspection tasks, to have adequate vision to meet the task requirements. Aging and problems that develop in the eye itself can gradually affect vision. Without regular vision testing, aircraft maintenance engineers may not notice that their vision is deteriorating. Ultimately, it is important for the individual to recognise when his vision is adversely affected, either temporarily or permanently, and to carefully consider the possible consequences of continuing to work when the task requires good vision.