PMID- 7517310
OWN - NLM
STAT- MEDLINE
DCOM- 19940804
LR  - 20131121
IS  - 1081-0803 (Print)
IS  - 1081-0803 (Linking)
VI  - 10
IP  - 2 Suppl
DP  - 1994 Mar-Apr
TI  - A simplified method to perform photorefractive keratectomy using an erodible 
      mask.
PG  - S246-9
AB  - BACKGROUND: Photorefractive keratectomy (PRK) using the current erodible mask 
      technique is difficult to perform, because of the stringent requirements in the 
      alignment of the eye to the mask and in the centration of the mask under the 
      laser beam. The surgeon has to manually control the eye-cup over 5 degrees of 
      freedom. If not accurately done this may lead to decentration of the ablation and 
      bring about technical problems during treatment. The aim of this study was to 
      find a way to improve and simplify the erodible mask procedure. METHOD: We used a 
      modified non-contact mask eye-cup with a rigid mechanical support to obtain a 
      precise and reliable positioning in space of the mask itself. Eye centration over 
      the pupillary aperture was obtained with conventional patient fixation on the 
      reference aiming light, coaxial to the laser beam path, and controlled using two 
      He-Ne beams aimed at the corneal apex. RESULTS: Good reliability was demonstrated 
      in the first 22 eyes operated on using this technique. All the masks were ablated 
      with good centration of the laser beam over the polymethylmethacrylate (PMMA) 
      button, and all the treatments were satisfactorily centered over the pupillary 
      aperture. No complications or side effects were encountered during the 
      treatments. CONCLUSIONS: Compared to the conventional erodible mask procedure, 
      this technique proved much faster to perform, was more comfortable for both 
      patient and surgeon, and was technically easier for the operator.
FAU - Gobbi, P G
AU  - Gobbi PG
AD  - Department of Ophthalmology and Visual Sciences, S. Raffaele Hospital, University 
      of Milan, Italy.
FAU - Carones, F
AU  - Carones F
FAU - Scagliotti, F
AU  - Scagliotti F
FAU - Venturi, E
AU  - Venturi E
FAU - Brancato, R
AU  - Brancato R
LA  - eng
PT  - Journal Article
PL  - United States
TA  - J Refract Corneal Surg
JT  - Journal of refractive and corneal surgery
JID - 9431306
RN  - 0 (Methylmethacrylates)
RN  - 196OC77688 (Methylmethacrylate)
SB  - IM
MH  - Cornea/*surgery
MH  - Humans
MH  - Laser Therapy/*instrumentation/*methods
MH  - Methylmethacrylate
MH  - Methylmethacrylates
MH  - Myopia/*surgery
MH  - Reproducibility of Results
EDAT- 1994/03/01 00:00
MHDA- 1994/03/01 00:01
CRDT- 1994/03/01 00:00
PHST- 1994/03/01 00:00 [pubmed]
PHST- 1994/03/01 00:01 [medline]
PHST- 1994/03/01 00:00 [entrez]
PST - ppublish
SO  - J Refract Corneal Surg. 1994 Mar-Apr;10(2 Suppl):S246-9.