title: [Ocular surface temperature of meibomia gland dysfunction patients and the melting point of meibomian gland secretions].
abstract: OBJECTIVE
  Since meibomian gland dysfunction (MGD) is thought to be caused by raising of the melting point and degeneration of lipid secretions, the melting point of secretions and the temperature of the ocular surface were investigated.
  
  
  METHODS
  Twenty-three patients with MGD [mean age 69.3 +/- 7.2 (mean standard deviation) years) were examined. Seven subjects without MGD (mean age 32.5 +/- 5.8 years) were also observed as controls.
  
  
  METHODS
  Solid secretions obtained from MGD patients were heated and the melting point was measured. The weight ratio of lipids and cell components was also determined.
  
  
  RESULTS
  Corneal temperature was 32.3 +/- 0.5 (mean +/- standard deviation) degrees C and eyelid temperature was 33.1 +/- 0.5 degrees C in the control subjects. Corneal temperature was 31.1 +/- 0.8 degrees C and eyelid temperature was 32.7 +/- 0.6 degrees C in MGD patients. However, the melting point of the secretions was 34.0 +/- 1.3 degrees C, which was higher than the temperature of the ocular surface and eyelid in both patients and controls. The cell components constituted about 60% of the secretions and the lipid composition, about 40%.
  
  
  CONCLUSIONS
  The cause of MGD is thought to be solid ification of lipids because of elevation of the melting point and the increase in the cell components of the secretions.
authors.affiliation: Department of Ophthalmology, Dokkyo University School of Medicine, Tochigi, Japan.
authors.forename: Osamu
authors.initials: O
authors.lastname: Terada
authors.forename: Keizo
authors.initials: K
authors.lastname: Chiba
authors.forename: Tadashi
authors.initials: T
authors.lastname: Senoo
authors.forename: Yoshitaka
authors.initials: Y
authors.lastname: Obara
mesh_terms: D000328:Adult; D000368:Aged; D001831:Body Temperature; D003315:Cornea / Q000502:physiology*; D005141:Eyelid Diseases / Q000503:physiopathology*; D005143:Eyelids / Q000502:physiology*; D006801:Humans; D050356:Lipid Metabolism; D008055:Lipids / Q000737:chemistry; D008537:Meibomian Glands / Q000378:metabolism*; D044366:Transition Temperature
chemical_list: D008055:Lipids