Contact Lens Fitting Guide Ajay Kumar Bhootra
Altering SCL parameters 32
Alternating or translating vision lens design 67
Aspheric multifocal lenses 68
Back vertex power of the trial lens 27
Bi-weekly disposable lenses 2
Blink rate 23
Changing back optic zone radius (BOZR) 32
Color cosmetic contact lenses 4
Concentric bifocal lenses 68
Contact lens case cleaning 34
Contact lens design variables 4
base curve 6
blending 8
center thickness 6
edge design 7
front and back surface 5
lenticular zone 9
optical zone 7
overall diameter 5
peripheral curves 6
sagittal height 8
Contact lenses
classifications 1
introduction to 1
Contact lens fitting
contraindications for 25
Contact lens power 9
Corneal curvature 21
Corneal diameter 21
Corneal irregularities 64
Corneal sensitivity 24
Daily disposable lenses 1
Diffractive lenses 68
Enhanced monovision 67
Fitting disposable soft contact lenses 39
Fitting methods for soft contact lenses for presbyopic correction 69
Fitting silicone hydrogel lenses 35
Fitting soft contact lenses
fitting methods 26
initial data gathering 27
trial lens selection 28
Fitting soft toric lenses 41
fitting methods 42
rotational behavior 43
Instructions for RGP lens insertion 59
Instructions for RGP lens removal 60
Instructions for soft lens insertion 39
Instructions for soft lens removal 40
Lens delivery 31
Lens movement 29
Lens ordering 56
Lens rotation 44, 45
Lens tightness 30
Lid tonicity 24
Monovision correction 66
Monthly disposable lenses 2
Nontranslating or simultaneous vision lens design 67
Ocular disorders that can be treated with bandage contact lenses
bullous keratopathy 62
corneal erosion 62
corneal injuries 63
corneal perforations 63
corneal ulcer 62
exposure keratitis 62
trichiasis 63
Orthokeratology 64
Orthoptics 63
Palpebral aperture 22
Photophobia 64
Pre-contact lens fitting eye examination 11
conjunctiva 16
cornea 15
eyelashes 14
eyelids 13
lid eversion 17
lid margin 14
Presbyopia and contact lens fitting 66
Presbyopic contact lens fitting
indications for 69
Pupil diameter 22
Refraction 24
RGP lens care and maintenance 59
RGP lens parameters change and lens fitting
Rigid gas permeable lenses 3
Schirmer test 19
Silicone hydrogel lens care system 38
Silicone hydrogel lenses 3
Soft contact lens care system 32
Soft contact lens fitting in dry eyes 39
Soft hydrogel lenses 3
Spherical RGP lens fitting
fitting methods 48
Static fit
central fit 53
edge clearance or lift 54
midperipheral fit 53
Tear break-up time 20
Tear film 18
examination of tear film 19
Tear lens 9
Tear prism height 19
Tear thinning time (TTT) 20
Therapeutic contact lens
care 65
maintenance 65
Therapeutic contact lens fitting 61
Traditional lenses 2
Trial lens selection 51
Unsightly eyes 64
Vision stability 31
Chapter Notes

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Contact Lens Fitting Guide
Contact Lens Fitting Guide
Ajay Kumar Bhootra B Optom DOS FAO FOAI FCLI ICLEP FIACLE (Australia) Diploma in Sportvision (UK) CEO and Dean Krishnalaya School of Optometry Kolkata, West Bengal, India
Jaypee Brothers Medical Publishers (P) Ltd
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© 2014, Jaypee Brothers Medical Publishers
All rights reserved. No part of this book may be reproduced in any form or by any means without the prior permission of the publisher.
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This book has been published in good faith that the contents provided by the author contained herein are original, and is intended for educational purposes only. While every effort is made to ensure accuracy of information, the publisher and the author specifically disclaim any damage, liability, or loss incurred, directly or indirectly, from the use or application of any of the contents of this work. If not specifically stated, all figures and tables are courtesy of the author. Where appropriate, the readers should consult with a specialist or contact the manufacturer of the drug or device.
Contact Lens Fitting Guide
First Edition: 2014
Printed at
The entire community of Optometrists and my two loving sons, who have been my best companions. They have given me the drive and discipline to tackle any task with enthusiasm and determination
Over the last 30 years, a lot of technological advancements have occurred in the field of optometry and ophthalmology. The corporate world has also changed. Business today has become highly networked. Patients and clients do not want to spend time in waiting. Practitioners also spend most of their time to work to retain their patients. In the process, they do not find any time to go back to the thick books to recapitulate the basic guidelines. This implies short, to-the-point guide books are very important today than ever before. Although they cannot replace the textbooks, they are a great help at the critical moment.
The idea of Contact Lens Fitting Guide has been conceived to serve this purpose and to create a source which is readily available with the eye care practitioners in their bag. The book is designed to have the relevant texts so that the reader can assess the key information quickly. Each chapter deals with the sequential steps needed for a particular type of contact lens. Meticulous planning has been done to design the contents and put them in an organized manner. However, the readers must take the help of other textbooks available on the subject to get into the depth.
I hope it will serve the purpose for which it has been written. I would like to welcome your suggestions to improve it further.
Ajay Kumar Bhootra
I would like to express my sincere thanks to Dr Divyesh P Shah, an eminent Ophthalmologist and Eye Surgeon of India, who provided me lots of support to complete this book. Dr Shah is a great personality in the field of eye and vision care. I am one of the greatest admirers of his skill, knowledge and practice. Out of the millions of people you meet, someone influences and initiates you to take a leap and do something extraordinary. I am fortunate that I had an opportunity to work with him for years; and I feel during the entire period of my association with him, I learned a lot from him.
A special thanks goes to my teammates, who helped me a lot by sharing their experiences.