The Jazz has 18 focusing lenses with a range of -20 to +20 dioptres which are easily adjusted using a May wheel. The ophthalmoscope also has 6 apertures which are described below. Keeler Jazz instruments 3 different identification rings that enable quick visual identification of your ophthalmoscope.

• Slim line profile
• Xenon illumination
• +/- 20D range of powers
• Renowned Keeler optics
• 6 apertures:
  • Small – enables quick entry into small, un-dilated pupils
  • Large - general exam through dilated pupil
  • Fixation Star – with graduated cross-hairs to measure eccentric fixation or to aid the location of lesions
  • Semi-Circle – for both field of view and depth perception
  • Cobalt blue – used with dye to view small lesions, foreign objects or abrasions on the cornea
  • Red-Free - enables easy identification of veins, arteries etc
• 3 coloured identification rings
• Soft carry case
• Instruction disc