Intraocular lens power calculation
Intraocular Lens Power Calculation
Intraocular lens power calculation (pronunciation: in-trah-ock-you-lar lens pow-er cal-cu-la-tion) is a critical step in the preoperative planning for cataract surgery or refractive lens exchange. It involves determining the power of the artificial lens (also known as an intraocular lens or IOL) that will be implanted in the patient's eye to achieve the desired postoperative refraction.
Etymology
The term is derived from the following words:
- Intraocular - from Latin 'intra' meaning 'within' and 'ocular' from Latin 'oculus' meaning 'eye'.
- Lens - from Latin 'lens', meaning 'lentil', due to the similarity in shape.
- Power - from Latin 'povoir' meaning 'to be able'.
- Calculation - from Latin 'calculatio', meaning 'a counting'.
Procedure
The calculation of intraocular lens power is based on various biometric measurements of the eye, including axial length, anterior chamber depth, and corneal curvature. These measurements are typically obtained using devices such as an optical biometer or an ultrasound A-scan. The data is then input into a formula, such as the Hoffer Q, Holladay, SRK/T, or Barrett Universal II, which calculates the optimal lens power.
Related Terms
- Biometry: The measurement of the physical characteristics of the eye.
- Phacoemulsification: A type of cataract surgery in which the lens is emulsified with an ultrasonic handpiece.
- Keratometry: The measurement of the corneal curvature.
- A-scan ultrasound: A diagnostic test used in ophthalmology to measure the length of the eye.
See Also
External links
- Medical encyclopedia article on Intraocular lens power calculation
- Wikipedia's article - Intraocular lens power calculation
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