If you are having LASIK, please read the other pages in this section carefully - they are reached from the blue link buttons on the left. The following are results graphs for my last few months results. All are taken at 3 months post op.

Accuracy Levels: The middle line is spot on and the dotted lines are +/- 1 Dioptre

The mean prescription for this group of patients was -3.09 Dioptres (from -10.25 to +4.13)

Another Accuracy Graph: Driving standard is about -0.75 Dioptres. A patient who gets even one eye

within half a Dioptre is usually very pleased.

Safety for treating myopia (short sight): "

"No harm" is no loss of Best Corrected Spectacle Visual Acuity (BCSVA).

One line loss is usually not noted by the patient

line loss as a measure of safety.  The chart plots how many lines gained or lost on the standard Snellen vision chart.

Most stay the same. Of those who gain sharpness of vision, a lot do so because of magnification effects;

glasses make the object size smaller, whereas contact lenses and Lasik do not. Our charts use the 

continental spacing of 1.2,  1.0,  0.8,  0.63,  0.5 which corresponds to the British

6/5,  6/6,  6/7.5,  6/10 and  6/12.  If the patient could see 1.0 prior to surgery and after it could only

see 0.8, then this would count as loss of one line of best corrected spectacle vision.

Patient population for the above graphs:

Defocus Equivalent: A technical graph of accuracy made by the numerical addition of the sphere and half the cylinder without taking into account the sign. ( +1 / -2 x 180 has a spherical equivalent of 0 but a defocus equivalent of 2). It is a truer measure of accuracy than the spherical equivalent used in other graphs. (sphere + half the cyl taking into account the sign). Here are some results that I did using the Technolas laser in 2003:

Safety for treating hyperopia (long sight): Nidek Laser results:

In hyperopia, the image size is bigger with glasses and smaller with contact lenses or Lasik/PRK.

Hence there is a tendency, opposite to myopia, to lose sharpness of vision with contact lenses

or Lasik because of the image size difference.

The average age of people presenting for hyperopic lasik is around 46y, whereas the average age for 

myopia is 33y. This is because the hyperopes can manage until middle age until their

fails. There is nothing worse than a middle aged hyperope as they can see neither distance or near.

Correspondingly, they are often amongst the happiest patients following refractive surgery.