HEALTH

Allergan to Sell Unit: Allergan Inc. said it had agreed to sell its diagnostic instrument subsidiary, Allergan Humphrey, to the German-based Carl Zeiss for an undisclosed price. Analysts valued the sale at between $50 million and $70 million. Sales at Allergan Humphrey have been declining since 1988, and although Allergan said the unit was not losing money, profit margins were slim. The Irvine-based company said it would use proceeds from the sale to reduce debt and strengthen its core businesses of developing pharmaceutical and consumer products for eye and skin care.