Understanding your prescription

Understanding your prescription

A prescription usually consists of three (sometimes four) numbers that look like this:
-2.00/-1.00 x 90 (‘+2.00 add’)

The first number

The higher this number is, the worse your unaided vision. If it’s negative (e.g. -2.00) you are short sighted, while a positive number (e.g. +2.00) indicates long-sightedness.

The second number

This number indicates the amount of distortion caused by astigmatism (a defect that causes blurred vision). It can have a – or a + in-front of it. The higher this number is, the greater the distortion. If you don’t have this second number, then you do not have astigmatism.

The third number

This number is the angle that your lens is rotated to in order to reduce the distortion caused by astigmatism.

A fourth number

Sometimes, there will be an additional number. This indicates Presbyopia, or ageing eyes. It represents an additional lens to help with reading. Now you know if you are long-sighted, short-sighted, have astigmatism or presbyopia.

Eligibility (faq)

At your consultation we will carry out a series of in-depth tests and examinations on your eyes, in order to check that you meet the criteria required. We will also talk you through the other options available, should you require another type of treatment.

Whether or not laser treatment can be performed on your eyes depends on a number of factors that need to be assessed by our eye care team at your initial consultation.

Although the majority of people who come to us are eligible for treatment, we may decline to treat you if the outcome cannot be accurately predicted or if laser eye surgery treatment is likely to cause complications to your sight. Your lifestyle and occupation may also be an important consideration.

In general, the suitability of our laser eye corrective surgery procedures for you depends on factors such as:

  • The degree of optical error
  • The thickness of your cornea
  • The existence of any eye disease
  • The size of your pupil
  • Corneal mapping data
  • Wavefront analysis results

You should ideally be able to answer YES to the following:

  • Do you suffer from shortsightedness, longsightedness or astigmatism?
  • Are you over 18 years old?
  • Is your prescription stable?
  • Are your eyes healthy and free from any eye disease?
  • Would you rather not wear glasses or contacts on a permanent basis?
  • At your Laser Vision Centre at RDH consultation we will carry out a series of in-depth tests and examinations on your eyes, in order to check that you meet the criteria required. We will also talk you through the other options available, should you require another type of treatment.

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Nuffield Health Derby Hospital. 
Rykneld Road, 
Littleover,
Derby, 
DE23 4SN

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