Primary Outcome Measures:
Secondary Outcome Measures:
- Operative time [ Time Frame: At operation ]
Record of operative surgical time in each type of operation
- Change of palpebral fissure height, MRD1 and MRD2 [ Time Frame: Baseline to 6 months ]
Difference in palpebral fissure height, MRD1 and MRD2 between baseline and each post-operative visit.
- Incidence of ptosis [ Time Frame: baseline to 6 months ]
Incidence of clinically significant ptosis, defined as upper eyelid drooping of more than 2 mm.
This study will evaluate patients who will undergo vitreoretinal surgery at UCSF Medical Center and San Francisco General Hospital. After informed consent has been obtained, the measurement of eyelid parameters such as levator function, palpebral fissure height, upper eyelid crease height, MRD1 and MRD2 will be collected at pre-operative and post-operative follow up visits. External eye photographs taken at each visit will be evaluated by a masked reader who will calculate the eyelid parameters. Dermographic data and intraoperative factors such as operative time and type of procedure will be collected. For statistical analysis, Repeated ANOVA, Paired t-test, Wilcoxon signed rank test, Chi-square test and Pearson's correlation analysis will be calculated with SPSS software.