Glossary

There is some terminology unique to Ophthalmology, which will often appear in letters from the eye department. Here are some terms to be aware of:

  • RAPD, Relative Afferent Pupil Defect
  • IOP, IntraOcular Pressure, (Normally 10-21mmHg)
  • OCT, Optical Coherence Tomography, typically used to detect sub-retinal fluid in AMD. YouTube video of an OCT recording of sub-retinal fluid.
  • AMD Age related Macular Degeneration, wet or dry according to the presence of sub-retinal fluid / haemorrhage.
  • POAG, Primary Open Angle Glaucoma. (commonest type of glaucoma)
  • HRT, Heidelberg Retinal Tomogram. A type of optic disc tomography which provides a 3D image of the optic nerve head, to aid diagnosis and follow-up of glaucoma, see YouTube Video of an HRT recording of glaucomatous disc.
  • YAG, neodymium-doped Yttrium Aluminium Garnet, a type of crystal used to generate LASER. This laser is usually used for photodisruption when treating posterior capsular opacification (PCO), or for making a hole in the iris to prevent angle closure glaucoma, Peripheral Iridotomy (PI)
  • Pseudophakic. An eye which has had cataract surgery.

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