title: A photometric study of the effect of pupil dilatation on Nd:YAG laser iridotomy area.
abstract: A photometric study of the effect of pupil dilatation on Nd:YAG laser iridotomy area was performed in 21 eyes of 21 patients. The iridotomy area was 0.075 (0.055) mm-2 (mean (SD)) before pupil dilatation and 0.073 (0.070) mm-2 after pupil dilatation (t test NS). Iridotomy area after pupil dilatation correlated with iridotomy area before pupil dilatation (r = 0.815, p < 0.01) but did not significantly correlate with measures of iridotomy shape or position, or with changed iris area following pupil dilatation. Two iridotomies became reduced to less than 20% of their initial area following pupil dilatation. Our findings suggest that the only effective method of avoiding development of unacceptably small iridotomy area after pupil dilatation is to create a sufficiently large iridotomy at the time of initial laser surgery.
authors: Princess Alexandra Eye Pavilion, Edinburgh.
authors: B W
authors: BW
authors: Fleck
authors: E
authors: E
authors: Fairley
authors: E
authors: E
authors: Wright
mesh_terms: D000208:Acute Disease; D000368:Aged; D002908:Chronic Disease; D005260:Female; D015812:Glaucoma, Angle-Closure / Q000209:etiology* / Q000601:surgery; D006801:Humans; D007498:Iris / Q000473:pathology / Q000601:surgery*; D053685:Laser Therapy / Q000009:adverse effects*; D008297:Male; D008875:Middle Aged; D015878:Mydriasis; D010783:Photometry