PMID- 10572885
OWN - NLM
STAT- MEDLINE
DCOM- 20000104
LR  - 20091111
IS  - 0023-2165 (Print)
IS  - 0023-2165 (Linking)
VI  - 215
IP  - 4
DP  - 1999 Oct
TI  - [Development of visual acuity in the early phase after photorefractive 
      keratectomy in myopia].
PG  - 233-6
AB  - BACKGROUND: Photorefractive keratectomy (PRK) using the excimer laser is an 
      accepted surgical technique for correction of myopic refraction errors in case of 
      spectacle or contact lens incompatibility. The purpose of this study was to 
      assess the development of uncorrected (UVA) and best-corrected visual acuity 
      (CVA) in the early course following PRK. PATIENTS AND METHODS: 48 eyes of 29 
      patients that underwent myopic photorefractive keratectomy using 193 nm excimer 
      laser (MEL 60, Aesculap-Meditec) were included in this study. The mean 
      preoperative spherical equivalent was -5.3 +/- 2.4 diopters (D) (range -1.75 to 
      -9.5 D). Pre-, intra- and postoperative treatment was standardized. The median 
      time interval to complete epithelial closure was 2 days. According to their 
      spherical equivalent, patients were divided in two groups: group 1 with myopia < 
      or = 6 D (n = 28), group 2 with myopia more than 6 D (n = 20). Examination of UVA 
      and CVA were performed preoperatively and on days 3, 7 as well as 1 month, 3 and 
      6 months postoperatively. RESULTS: On day 3 after surgery UVA was 0.43 +/- 0.21 
      for group 1 with myopia < or = 6 D, and 0.36 +/- 0.14 for group 2 with myopia 
      more than 6 D. The UVA was stable after 3 months (0.92 +/- 0.29 and 0.66 +/- 
      0.20, respectively), the CVA was stable after 1 month (1.04 +/- 0.18 and 0.86 +/- 
      0.19, respectively). After surgery, the UVA increased by +0.73 +/- 0.25, whereas 
      the CVA increased by +0.05 +/- 0.10 for the whole group. The difference comparing 
      pre- and postoperative UVA was significantly higher in group 1 (0.81 +/- 0.22) 
      than in group 2 (0.60 +/- 0.26) (p = 0.002). However, postoperative CVA values 
      were not significantly different from preoperative values in both groups after 6 
      months (p = 0.3). CONCLUSION: Useful uncorrected visual acuity is normally 
      achieved at day 3 after PRK in eyes with mild to moderate myopia. With higher 
      degrees of myopia the uncorrected visual acuity does increase slower towards a 
      lower level. One of the reasons for this phenomenon might be a significant 
      regression of the refractive effects during the first half year after surgery.
FAU - Nguyen, N X
AU  - Nguyen NX
AD  - Augenklinik mit Poliklinik, Universitat Erlangen-Nurnberg. 
      nhung.nguyen@augen.med.uni-erlangen.de
FAU - Langenbucher, A
AU  - Langenbucher A
FAU - Walter, A
AU  - Walter A
FAU - Kuchle, M
AU  - Kuchle M
FAU - Seitz, B
AU  - Seitz B
LA  - ger
PT  - English Abstract
PT  - Journal Article
TT  - Entwicklung der Sehscharfe in der Fruhphase nach photorefraktiver Keratektomie 
      bei Myopie.
PL  - Germany
TA  - Klin Monbl Augenheilkd
JT  - Klinische Monatsblatter fur Augenheilkunde
JID - 0014133
SB  - IM
MH  - Adult
MH  - Female
MH  - Humans
MH  - Lasers, Excimer
MH  - Male
MH  - Myopia/physiopathology/*surgery
MH  - *Photorefractive Keratectomy
MH  - Postoperative Complications/*physiopathology
MH  - Time Factors
MH  - Treatment Outcome
MH  - Visual Acuity/*physiology
EDAT- 1999/11/26 00:00
MHDA- 1999/11/26 00:01
CRDT- 1999/11/26 00:00
PHST- 1999/11/26 00:00 [pubmed]
PHST- 1999/11/26 00:01 [medline]
PHST- 1999/11/26 00:00 [entrez]
AID - 10.1055/s-2008-1034705 [doi]
PST - ppublish
SO  - Klin Monbl Augenheilkd. 1999 Oct;215(4):233-6. doi: 10.1055/s-2008-1034705.