Theory and Practice of Optics & Refraction- E BookTheory and Practice of Optics and Refraction, in its fifth edition, continues to be a part of Modern System of Ophthalmology (MSO) Series. Without altering the basic text and layout, each chapter has been thoroughly revised to keep abreast with the newer concepts and principles of optics and refraction involved in investigative as well as therapeutic optical modalities evolved over the period of time. • Provides information on basic principles of Optics, Refraction and Optical Instruments to Ophthalmology residents and students of Optometry as well as Orthoptics • Text is organized in an attractive four-colour format to make the understanding, retention and reproducibility of facts easy • Includes newer concepts in Refractive Surgery like Topoguided LASIK, Contoura Vision Technology, All Femtosecond Laser Surgery, ReLEx and Corneal Inlay for Presbyopia including Presbyopic Allogenic Refractive Lenticule (PEARL) • Recently available Phakic and near vision enabling Intra Ocular Lenses have been added • Future Refractive Surgeries such as LIRIC, RELIMP and LIKE have been added • Incorporates advances in Aberrometry, Wavefront Technology, Anterior Segment Optical Coherence Tomography (AS-OCT), Enhanced Depth OCT, Confocal Microscopy of Cornea and anterior segment Ultrasound Bio Microscopy (UBM) • Digital Eye Strain and Role of Smartphones in Ophthalmology have been discussed in detail • Chapter on Clinical Refraction has been refurbished effectively and text on Corneal Topography expanded with essential newer developments |
Contents
2 Visual acuity contrast sensitivity and tests for potential vision | 40 |
3 Errors of refraction and binocular optical defects | 69 |
4 Asthenopia digital eye strain anomalies of accommodation and convergence | 98 |
Determination of the errors of refraction | 129 |
6 Keratometry corneal topography and aberrometry | 170 |
7 Spectacles | 219 |
8 Contact lenses | 258 |
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Common terms and phrases
aberrations ablation accommodation angle aniseikonia anisometropia aphakia aspheric astigmatism axial axis base curve beam bifocal binocular calculation camera cataract central centre chart clinical colour contact lens contrast sensitivity convergence convergence insufficiency convex corneal surface corneal topography correction curvature cylinder degrees device diameter diffractive dioptres disc distance emmetropic epithelial fixation flap focal focus focused formula front fundus glasses glaucoma gonioscopy hypermetropia illumination implantation IOL power keratoconus keratometer keratometry laser LASIK lensmeter light source low vision macular magnification measurement meridian method microscope mirror myopia normal object ocular ophthalmoscopy optical zone patient Pentacam peripheral Placido plane position posterior presbyopia principle prism procedure pupil rays reflected reflex refractive error refractive surgery retina retinoscopy RNFL scan scleral segment slit-lamp smart phone Snellen's soft lenses spectacles spherical technique thickness tion toric types vertex vertical visual acuity wavefront wavelength