Any patient who is advised of cataract surgery has to face this question. The question is passed on to the treating surgeon and his team. One particular IOL may be the best for one patient but may not be suitable for another patient. In this blog, I will discuss different aspects of an IOL.
IOLs (Intraocular Lenses) are of different types, commonly known as the lens implanted inside the eye during cataract extraction.
Mono-focal IOL: – This is the best IOL if the patient is ready to accept glasses after cataract surgery. This is the most common type of IOL used during cataract surgery. Because the patient can adjust the lens immediately after surgery, there is no loss of contrast or other issues like glare.
But it works for one distance only. In simple language, If a patient can see clearly without glasses for distance after cataract surgery, he will need nearly +2.50DS power glass to read near objects.
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And if he can read clearly near objects without glasses, he will need about -2.50DS power glass to see distant objects. So, it is very clear that with a mono-focal lens (IOL implantation), the patient will be required to use glasses to clearly see near and distant objects.
Multi-focal and Trifocal IOL:- These are also called premium IOLs. Patients who are not willing to use glasses after cataract surgery and can afford costly IOLs can go for this kind of IOLs.
The best thing about these types of IOLs is that the patient can carry out his routine activities without any glasses after surgery, provided the calculation of IOL power before surgery is perfect (which may not be the case in each and every patient due to limitations of the procedures) and the surgical procedure also goes uneventful.
Trifocal IOLs: – cover three distances: Distant, Near and Intermediate (Computer) and the Multifocal or Bifocal IOLs cover only two distances, namely Distant and Near.
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However, the contrast sensitivity and glare while driving at night are sometimes an issue. Thorough counselling of the patient needs to be done before going for premium IOLs as the patient’s expectations sometimes become unrealistic as he is spending an extra amount.
Toric IOLs:- Some patients have pre-existing astigmatism, i.e. they have been using cylindrical glasses even before surgery. This astigmatic (Cylindrical) error must be nullified by implanting a toric IOL. If all the calculations before surgery and the surgical procedure go uneventful, the patient gets rid of the spectacles after surgery. Again, this IOL is a costly one and precision of surgery is required.
However, this must be kept in mind that each and every surgery is associated with its inherent risks, and no amount of money spent can make the surgery risk free.
The Faculty of Allied Health Science (FAHS) offers 9 UG and 9 PG courses and PhD programmes in Microbiology, Biochemistry, Neuroscience, Nutrition & Dietetics and Radio-Imaging Technology. This year we have introduced a new PG course – M.Sc. Biotechnology and Bioinformatics. The Faculty of Allied Health Sciences is committed to providing the highest quality education by strengthening classroom teaching by highly skilled and experienced faculty with hands-on training through clinical postings in our Hospital within the campus with 24×7 working labs equipped with all modern facilities.
Dr. Ashwani Kumar Ghai
Department of Optometry
Faculty of Allied Health Science