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Prism reflex test (Krimsky's corneal reflex test) Prism reflex test first described by Krimsky has become universally accepted as a practical method of estimating the size of the angle of squint in patients with a blind or deeply amblyopic eye with or without eccentric fixation. To perform the test, patient is asked to fixate on a point light and prisms of increasing strength (with apex towards the direction of manifest squint) are placed in front of the normal fixating eye till the corneal reflex is centred in the squinting eye (Fig. 6.7). The power of prism required to centre the light reflex in the squinting eye equals the amount of squint in prism dioptres. To avoid errors from parallax, the examiner must observe the corneal reflex with one eye by sitting directly in front of the deviating eye while keeping his other eye closed. In an alternative method, prism of increasing power can be placed in front of the deviating eye until the corneal reflexion is centred. However, since the observation of the corneal reflexion through prisms is difficult, therefore, the method described above is preferred. Advantages of Krimsky's test. •Since the test requires only that the patient fixate the light, being entirely objective otherwise, it is useful in testing small children. • It is quicker to perform than the prism cover test. •It can be used in patients in whom the deviating eye has a low visual acuity or has lost central fixation. Limitations of the Krimsky's test . Since the angle kappa is included in the measurement, the test is inaccurate. . It is impossible to perform the test for distance fixation, since the position of the examiner's head required to obtain an accurate observation prevents the patient from seeing the fixation light. Like My Facebook Page. / optometryacademy Some of My optometry Related videos are given below: 1. Paediatric Vision Charts • Children Vision Acuity Charts 2. Diplopia Charting and Interpretation • Diplopia Charting and Interpretation 3. Retinoscopy • Retinoscopy 4. 4 Prism base out test • 4 Prism Base Out Test 5. Bagolini striated glass test • Bagolini striated glass test 6. Jackson cross cylinder • Jackson's Cross Cylinder | JCC | Refr... 7. Duochrome Test • Duochrome Test 8. Worth’s four dot test • Worth’s four dot test 9. Amplitude of Accommodation • Amplitude of Accommodation 10. Brock string • Brock String 11. worth four dot test • Worth Four Dot Test (WFDT) 12. worth four dot test in hindi • Worth Four Dot Test in Hindi 13. Subjective refraction • Subjective Refraction 14. Chsme ka number kaise nikale • चश्मे का नंबर कैसे निकालें ? (Chasme ... 15. How to keep your eyes healthy • 6 Tips to keep your eyes healthy 16. Corona and eye • Updates For Ophthalmologist and Optom... 17. Covid 19 and conjunctivitis • Covid 19 and conjunctivitis 18. Corona virus ke laksan aur bachaw ke upay • कोरोना वायरस के लक्षण एवं बचाव के उपाय 19. Role of social distancing • Role of Social Distancing 20. Hirschberg test | Corneal reflex test | CLR • Hirschberg Test | Corneal Light Refle... 21. Cross Retinoscopy • Cross Retinoscopy | Retinoscopy Proce... 22. 15 Eye exercise to relax and strengthen your eye muscles • 15 Eye Exercises to Relax and Strengt... 23. Maddox Rod test • Maddox Rod Test 24. Duochrome Test • Duochrome Test | Red Green Test | FRI... 25. Aankho ke liye best hai ye exercise • Eye Exercise | Improve vision with... Chapters 00:00 Start 00:33 Required instruments 00:43 Optical Principle 01:10 Procedure 01:47 Recording 01:57 Advantages of Krimsky test 02:25 Limitations of the Krimsky test 02:44 Video Making 03:15 Video Credit mofified krimsky test what is a modified allen test modified krimsky test krimsky test procedure modified krimsky test ppt difference between krimsky and modified krimsky test krimsky test vs hirschberg modified krimsky test slideshare what is krimsky test modified krimsky test procedure modified krimsky test vs krimsky how to do a modified allen test #PrismBarReflexTest #optometrists #optometryacademy #optometry #ophthalmology #orthoptist #strabismologist #eye_care #eyes #paresis #eyehealth #eyeball #strabismus #squintyeyes #squints #amblyopia #optom #strabismus #stereopsis #steroacuity #stereopsis #prism #convergence #glasses #diplopia #suppression #synoptophore #AkleshKumar #MaddoxRod #Prism #PBCT #PCT#Esotropia #Exotropia #Hypertropia #Hypotropia #PBRT #PRT