A Comparison of Lower Eyelid Retraction in Normal Individuals with Positive versus Negative Orbital Vector.
PURPOSE
The present study aimed to compare lower eyelid retraction (LER) in individuals with a positive orbital vector with that of individuals with a negative orbital vector.


MATERIALS AND METHODS
This cross-sectional study was conducted on 123 normal individuals including 64 men and 59 women aged 20-80 years. After the individuals underwent Hertel exophthalmometry, two side-view and front-view photos were taken using a camera. The orbital vector angle and the extent of scleral show were then measured in millimeter, using the Photoshop software. Eventually, the recorded data were analyzed through statistical software.


RESULTS
The findings of this study showed that LER has a significant correlation with orbital vector angle and the extent of proptosis (P < 0.05). The mean value of orbital vector angle in individuals without LER was 9.76°, while this figure was calculated to be - 13.65° in individuals with LER. The mean protrusion value based on Hertel exophthalmometry was 14.08 mm in individuals without LER and 16.27 mm in individuals with LER. The extent of scleral show had a significant correlation with proptosis and orbital vector angle (P = 0.01), with a mean value of - 0.41 mm in individuals without LER and 0.94 mm in participants with LER.


CONCLUSIONS
The prevalence of LER and scleral show is positively correlated with the extent of proptosis and negatively correlated with orbital vector angle.
['Rajabi|Mohammad Taher|MT|', 'Malmir|Minoo|M|', 'Mahmoudzadeh|Raziyeh|R|', 'Salabati|Mirataollah|M|', 'Tabatabaie|Seyed Ziaeddin|SZ|', 'Rajabi|Mohammad Bagher|MB|', 'Hosseini|Seyedeh Simindokht|SS|']
D000328:Adult D000368:Aged D000369:Aged, 80 and over D001699:Biometry D003430:Cross-Sectional Studies D003941:Diagnostic Techniques, Ophthalmological D005094:Exophthalmos D005141:Eyelid Diseases D005260:Female D006801:Humans D008297:Male D008875:Middle Aged D009915:Orbit D012189:Retrospective Studies D055815:Young Adult
lower eyelid retraction Hertel exophthalmometry scleral show proptosis