Objective : The relationship between the age and upper lid chalasia were analyzed. The pre - and postoperative results of eyelid aesthetic measurement were compared. Methods :150 cases who were divided into three groups of 35- 44

45 -~ 54 and 55 -65 years old underwent blepharoplasty of the upper lid ehalasia. The changes of the eye fissure height( H)

medial canthus anger( α) and lateral canthus anger(β ) before and after operation were measured

and their relationships with different ages were analyzed statistically. The principles of the incision design and the management of orbital septum and lateral canthus were presented. Results : The results of statistic analysis indicated that upper eyelid ptosis increased significantly with the ages (P <0. 01) and the degree of the ptosis was more serious in lateral eanthus than that in medial canthus (P <0. 01). Comparing pre - with postoperation

the upper lid chalasia reached significant correction in all three age groups. The correction of upper lid aesthetic measurement was of more significance in 45- 54 than in 55- 65 year - old group. Conclusion : The study demonstrated that the quantitative analysis of aesthetic measurement of upper eyelid before and after operation had guiding significance in precisely controlling the indication

choosing the operative methods and evaluating the operative effects.