Table 1
Refraction, HOA, Optical Zone (OZ), Ablation Zone (AZ) and Tissue Ablation Depth of the Six Refractive Types
Refractive Type | Refraction | HOA (μm) | OZ × AZ (mm) | Tissue Depth (μm) |
---|
Myopia | −4DS | 0.0 | 6 × 8 | 64 |
Hyperopia | +2DS | 0.0 | 5 × 9 | 26 |
Myopic astigmatism | −2DS/−1DC × 34° | 0.0 | 6 × 8 | 49 |
Hyperopic astigmatism | +2DS/−1DC × 65° | 0.0 | 5 × 9 | 25 |
Mixed astigmatism | +2DS/−3DC × 45° | 0.0 | 6 × 8 | 38 |
Therapeutic | +2.4DS/−3.5DC × 17° | 1.2 | 6 × 8 | 32 |
Table 2
Average Eye Movement from 100 Simulated Samples
Direction | Eye Movement (mm) |
---|
x
| 0.096 ± 0.016 |
y
| 0.085 ± 0.017 |
Table 3
Comparison of rms Fitting Error in μm
Refractive Type | Type A | Type B (0.7 mm) |
---|
Myopia | 0.038 | 0.068 |
Hyperopia | 0.090 | 0.105 |
Myopic astigmatism | 0.041 | 0.113 |
Hyperopic astigmatism | 0.068 | 0.109 |
Mixed astigmatism | 0.045 | 0.079 |
Therapeutic | 0.045 | 0.090 |
Table 4
Comparison of the Number of Pulses Used in Fitting
Refractive Type | Type A | Type B (0.7 mm) |
---|
Myopia | 700 | 11784 |
Hyperopia | 1926 | 9787 |
Myopic astigmatism | 845 | 10405 |
Hyperopic astigmatism | 1462 | 7335 |
Mixed astigmatism | 933 | 8412 |
Therapeutic | 749 | 7259 |
Table 5
Parameters Used in the Simulation for the Two Types of Lasers
Parameter | Type A | Type B |
---|
Ablation repetition rate (Hz) | 20 | 60 |
Tracking speed (Hz) | 60 | 200 |
Tracking postional accuracy (μm) | 50 | 50 |
Tracking rotational accuracy (°) | 0.5 | 0.5 |
Tracking latency time (ms) | 15 | 15 |
Postional alignment error (μm) | 15 | 15 |
Rotational alignment error (°) | 0.5 | 0.5 |
Beam variability (% of beam profile) | ±4 | ±4 |
Table 6
Comparison of rms Error (in Microns) for both Types of Lasers for all Refractive Types
Errors | Fitting | Registration | Tracking | Laser Beam | Total |
---|
Type A | Type B | Type A | Type B | Type A | Type B | Type A | Type B | Type A | Type B |
---|
Myopia | 0.038 | 0.068 | 0.108 ± 0.057 | 0.116 ± 0.058 | 0.044 ± 0.002 | 0.162 ± 0.010 | 0.023 ± 0.008 | 0.021 ± 0.002 | 0.133 ± 0.048 | 0.220 ± 0.036 |
Hyperopia | 0.090 | 0.105 | 0.061 ± 0.030 | 0.052 ± 0.026 | 0.039 ± 0.002 | 0.079 ± 0.005 | 0.011 ± 0.002 | 0.010 ± 0.001 | 0.134 ± 0.015 | 0.171 ± 0.009 |
Myopic astigmatism | 0.041 | 0.113 | 0.075 ± 0.038 | 0.081 ± 0.043 | 0.046 ± 0.003 | 0.150 ± 0.009 | 0.021 ± 0.006 | 0.020 ± 0.001 | 0.115 ± 0.027 | 0.227 ± 0.020 |
Hyperopic astigmatism | 0.068 | 0.109 | 0.043 ± 0.024 | 0.041 ± 0.025 | 0.033 ± 0.002 | 0.069 ± 0.006 | 0.009 ± 0.002 | 0.009 ± 0.001 | 0.103 ± 0.012 | 0.142 ± 0.010 |
Mixed astigmatism | 0.045 | 0.079 | 0.064 ± 0.028 | 0.066 ± 0.029 | 0.039 ± 0.002 | 0.111 ± 0.007 | 0.016 ± 0.004 | 0.015 ± 0.001 | 0.095 ± 0.019 | 0.160 ± 0.013 |
Therapeutic | 0.045 | 0.090 | 0.059 ± 0.028 | 0.059 ± 0.031 | 0.043 ± 0.003 | 0.126 ± 0.007 | 0.017 ± 0.004 | 0.016 ± 0.001 | 0.107 ± 0.017 | 0.205 ± 0.012 |
Average | 0.055 | 0.094 | 0.068 ± 0.022 | 0.068 ± 0.027 | 0.041 ± 0.005 | 0.116 ± 0.037 | 0.016 ± 0.006 | 0.015 ± 0.005 | 0.115 ± 0.016 | 0.188 ± 0.035 |
Table 7
Comparison of rms Error (in Microns) with and without Registration Alignment Correction
Refractive Type | Without Alignment | With Alignment |
---|
Type A | Type B | Type A | Type B |
---|
Myopia | 0.360 ± 0.175 | 0.413 ± 0.214 | 0.116 ± 0.060 | 0.115 ± 0.058 |
Hyperopia | 0.202 ± 0.096 | 0.184 ± 0.093 | 0.055 ± 0.031 | 0.054 ± 0.029 |
Myopic astigmatism | 0.246 ± 0.126 | 0.243 ± 0.119 | 0.075 ± 0.038 | 0.072 ± 0.037 |
Hyperopic astigmatism | 0.171 ± 0.079 | 0.157 ± 0.088 | 0.045 ± 0.025 | 0.046 ± 0.025 |
Mixed astigmatism | 0.250 ± 0.110 | 0.254 ± 0.113 | 0.072 ± 0.038 | 0.068 ± 0.034 |
Therapeutic | 0.209 ± 0.092 | 0.202 ± 0.087 | 0.059 ± 0.030 | 0.058 ± 0.029 |
Average | 0.240 ± 0.066 | 0.242 ± 0.091 | 0.070 ± 0.025 | 0.069 ± 0.025 |
Table 8
Comparison of rms Error (in Microns) with and without Tracking
Refractive Type | Without Tracking | With Tracking |
---|
Type A | Type B | Type A | Type B |
---|
Myopia | 0.465 ± 0.143 | 2.981 ± 0.242 | 0.052 ± 0.004 | 0.128 ± 0.006 |
Hyperopia | 0.272 ± 0.045 | 0.777 ± 0.095 | 0.045 ± 0.003 | 0.062 ± 0.004 |
Myopic astigmatism | 0.364 ± 0.090 | 2.469 ± 0.199 | 0.053 ± 0.003 | 0.118 ± 0.007 |
Hyperopic astigmatism | 0.227 ± 0.049 | 0.608 ± 0.112 | 0.040 ± 0.002 | 0.052 ± 0.004 |
Mixed astigmatism | 0.289 ± 0.058 | 1.409 ± 0.153 | 0.045 ± 0.002 | 0.086 ± 0.005 |
Therapeutic | 0.315 ± 0.063 | 1.636 ± 0.134 | 0.049 ± 0.002 | 0.096 ± 0.006 |
Average | 0.322 ± 0.084 | 1.645 ± 0.933 | 0.047 ± 0.005 | 0.090 ± 0.030 |