The LASIK industry & the FDA have conspired since LASIK's inception to purposely withhold information vital to the public in making a truly informed LASIK decision. With, The hope is to show you what the industry and FDA would not and did not even think of doing until LASIK casualties started speaking out, and yet, they still did NOTHING.
Measurement of Contrast Sensitivity and Glare Under Mesopic and Photopic Conditions PDF Print E-mail
Monday, 18 September 2006 13:36

Following Wavefront-guided and Conventional LASIK Surgery

Journal of Refractive Surgery  Vol. 22   No. 7

September 2006


Hyung Keun Lee, MD; Chul Myung Choe, MD; Kyoung Tak Ma, MD; Eung Kweon Kim, MD, PhD


PURPOSE: To compare contrast and glare vision in a prospective study of eyes treated using conventional and wavefront-guided LASIK surgery. The reproducibility of a glaremeter device used to quantitatively measure glare and halo was also determined.


METHODS: Ninety-two eyes of 46 patients underwent conventional LASIK surgery and 104 eyes of 52 patients underwent wavefront-guided LASIK surgery. Visual acuity, glare disability measured using a glaremeter, and contrast sensitivity assessed using a Pelli-Robson chart were measured monthly for 6 months postoperatively. Glaremeter testing was performed under both mesopic (5.4±0.4 cd/m2) and photopic (78.3±4.4 cd/m2) conditions. To evaluate the reproducibility of the glaremeter, 36 eyes of 18 nonoperated myopic patients were tested.


RESULTS: The coefficient of variation and the reliability coefficient for the glare test were 13.6% and 95.2%, respectively. The glaremeter showed that glare disability under mesopic conditions differed between conventional and wavefront-guided LASIK eyes over 6-month follow-up (907.5±491.5 vs 986.1±448.0 pixels preoperatively and 1717.1±521.2 vs 1407.8±411.3 pixels at 6 months, P<.0001). At 6 months, contrast sensitivity log values were 1.62±0.31 and 1.78±0.34 for conventional and wavefront-guided LASIK eyes, respectively (P=.010). The visual complaint score was lower in the wavefront-guided LASIK group (P=.0116).

CONCLUSIONS: Compared to conventional ablation, wavefront-guided ablation provided superior outcomes in terms of postoperative glare under mesopic conditions, subjective complaints, and contrast sensitivity. In addition, it appears the glaremeter can be used for clinical quantitative evaluation of glare and halo. [J Refract Surg. 2006;22:647-655.]