title: Retinal ganglion cell layer and visual function in a patient with optic disc drusen.
abstract: BACKGROUND
  To correlate the retinal ganglion cell pattern to visual acuity and visual field data in a patient with bilateral optic disc drusen, a quantitative clinicopathological study was carried out.
  
  
  METHODS
  Both retinae of a patient with optic drusen were whole-mounted. Retinal ganglion cell counts were made using a sampling scheme covering the whole retina and compared to the findings in 10 normal retinae. Relative ganglion cell reduction in the drusen retinae was correlated to clinical data.
  
  
  RESULTS
  The total retinal ganglion cell count was reduced from 1244858+/-98736 in normal retinae to 305319 on the right and 527571 on the left eye with optic disc drusen. Large ganglion cells had a better chance of survival. Parafoveal ganglion cell loss was 57% for the right and 36% for the left eye, while visual acuity was 0.8 and 1.0 respectively. The mean light sensitivity loss increased from the centre (6.2 dB) to paracentral (9.9 dB), mid-peripheral (13.7 dB) and outer peripheral (15.0 dB) retina, while ganglion cell losses were smallest in outer peripheral retina (21.9%), followed by central (53.0%), mid-peripheral (70.9%) and paracentral retina (87.7%).
  
  
  CONCLUSIONS
  These data validate Frisén's theory on central retinal resolution and provide the structural basis for the clinical rule that low visual acuity should not be attributed to disc drusen. Automated light sense perimetry gives an inadequate picture of retinal damage caused by optic disc drusen.
authors.affiliation: Universitäts-Augenklink, Freiburg, Germany.
authors.forename: M M
authors.initials: MM
authors.lastname: Gellrich
authors.forename: S
authors.initials: S
authors.lastname: Neumaier
authors.forename: C
authors.initials: C
authors.lastname: Auw-Hädrich
authors.forename: N C
authors.initials: NC
authors.lastname: Gellrich
authors.forename: L L
authors.initials: LL
authors.lastname: Hansen
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002452:Cell Count; D048429:Cell Size; D006801:Humans; D008297:Male; D008875:Middle Aged; D015594:Optic Disk Drusen / Q000473:pathology* / Q000503:physiopathology; D015203:Reproducibility of Results; D012165:Retinal Ganglion Cells / Q000473:pathology*; D014792:Visual Acuity; D058609:Visual Field Tests; D014794:Visual Fields