🎯 Key points for quick navigation: 00:00 *In presbyopia, there are practical and theoretical tests; practical tests include red-green tests and the CCF fixed cross cylinder test.* 00:13 *The red-green test assesses chromatic aberrations in the eye and is more common due to its theoretical basis.* 00:26 *In near vision tests, such as the red-green test, a presbyopic person might struggle due to inadequate accommodative reserves.* 01:22 *The red-green test is based on longitudinal chromatic aberrations, and characters on a green background are typically preferred.* 02:18 *Characters on green are preferred because of the diffusion pattern; the green blur diameter is smaller than the red.* 06:08 *Rarely, subjects may prefer red if they have accommodative spasms, affecting the red-green preference.* 09:27 *CCF (Cross Cylinder Fixed) tests use the formula with +0.50 at 90°, creating direct astigmatism.* 13:19 *Astigmatism created by CCF is direct, affecting the image's horizontal and vertical diffusion tasks.* 16:13 *Positive lenses are added until preference inversion occurs to determine the addition needed for comfortable near vision.* 17:47 *Return to previous sphere when preferences invert for equal perception; presbyopes prefer slightly in front for better comfort.* 19:13 *Add positive lenses until inversion, then step back for equal perception; this concludes the test.* 19:28 *The Shird test is lengthy and requires positioning a reading test at 40 cm.* 19:54 *For presbyopic subjects, assess maximum accommodation by introducing negative lenses until blurred vision.* 22:06 *Determine maximum accommodation by reverting to the last lens that provided clear vision.* 24:03 *Delta Shird involves adding lenses for maximum accommodation at 40 cm, determining its necessity.* 27:47 *Calculate maximum accommodation using the Delta Shird lens to ensure focused vision.* 31:10 *Use Delta Shird for the right lens addition allowing comfortable vision at 40 cm.* 36:30 *For a 50-year-old, expected lens addition is around +1.25 or +1.50 based on age.* 39:20 *Lens additions beyond +2.50 are unusual unless there’s a pathology or low acuity.* 39:35 *The distance at which a person habitually sees clearly is termed "revip," while the ideal working distance, "Harmon," should ideally be equal to revip in normal vision.* 40:29 *A greater difference between revip and Harmon indicates a need to bring objects closer or further away for clear vision, suggesting the visual power (VP) is either too weak or too strong.* 41:40 *VP refers to the lens's overall power for near vision, whereas "addition" represents the difference between distance and near vision requirements.* 43:19 *During eye exams, it's important to distinguish between VP and addition, and ensure correct terminology is used when explaining to an optometry jury.* 45:08 *If during a red-green test, letters on a red background appear sharper, it indicates a stronger VP.* 46:06 *Two responses are possible during preliminary exams, unlike when determining addition, which has a single outcome.* 47:14 *To assess near vision, negative lenses are added stepwise until clarity decreases, measuring accommodative capacity.* 49:58 *Accommodation max, when lenses no longer enable clear vision, is calculated using the final steps of negative lenses used.* 51:48 *Determining comfort for vision at different distances requires recalibrating image chains and considering desired lens comfort.* 55:06 *The addition of corrective lenses affects near vision more significantly than distance vision.* 58:29 *Overlapping comfortable vision zones hint at potential for bifocal lenses; gaps necessitate progressive lenses.* 59:10 *Presbyopia compensation methods with contact lenses include monovision (one eye for near, one for far vision) and bifocal techniques.* Made with HARPA AI
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🎯 Key points for quick navigation:
00:00 *In presbyopia, there are practical and theoretical tests; practical tests include red-green tests and the CCF fixed cross cylinder test.*
00:13 *The red-green test assesses chromatic aberrations in the eye and is more common due to its theoretical basis.*
00:26 *In near vision tests, such as the red-green test, a presbyopic person might struggle due to inadequate accommodative reserves.*
01:22 *The red-green test is based on longitudinal chromatic aberrations, and characters on a green background are typically preferred.*
02:18 *Characters on green are preferred because of the diffusion pattern; the green blur diameter is smaller than the red.*
06:08 *Rarely, subjects may prefer red if they have accommodative spasms, affecting the red-green preference.*
09:27 *CCF (Cross Cylinder Fixed) tests use the formula with +0.50 at 90°, creating direct astigmatism.*
13:19 *Astigmatism created by CCF is direct, affecting the image's horizontal and vertical diffusion tasks.*
16:13 *Positive lenses are added until preference inversion occurs to determine the addition needed for comfortable near vision.*
17:47 *Return to previous sphere when preferences invert for equal perception; presbyopes prefer slightly in front for better comfort.*
19:13 *Add positive lenses until inversion, then step back for equal perception; this concludes the test.*
19:28 *The Shird test is lengthy and requires positioning a reading test at 40 cm.*
19:54 *For presbyopic subjects, assess maximum accommodation by introducing negative lenses until blurred vision.*
22:06 *Determine maximum accommodation by reverting to the last lens that provided clear vision.*
24:03 *Delta Shird involves adding lenses for maximum accommodation at 40 cm, determining its necessity.*
27:47 *Calculate maximum accommodation using the Delta Shird lens to ensure focused vision.*
31:10 *Use Delta Shird for the right lens addition allowing comfortable vision at 40 cm.*
36:30 *For a 50-year-old, expected lens addition is around +1.25 or +1.50 based on age.*
39:20 *Lens additions beyond +2.50 are unusual unless there’s a pathology or low acuity.*
39:35 *The distance at which a person habitually sees clearly is termed "revip," while the ideal working distance, "Harmon," should ideally be equal to revip in normal vision.*
40:29 *A greater difference between revip and Harmon indicates a need to bring objects closer or further away for clear vision, suggesting the visual power (VP) is either too weak or too strong.*
41:40 *VP refers to the lens's overall power for near vision, whereas "addition" represents the difference between distance and near vision requirements.*
43:19 *During eye exams, it's important to distinguish between VP and addition, and ensure correct terminology is used when explaining to an optometry jury.*
45:08 *If during a red-green test, letters on a red background appear sharper, it indicates a stronger VP.*
46:06 *Two responses are possible during preliminary exams, unlike when determining addition, which has a single outcome.*
47:14 *To assess near vision, negative lenses are added stepwise until clarity decreases, measuring accommodative capacity.*
49:58 *Accommodation max, when lenses no longer enable clear vision, is calculated using the final steps of negative lenses used.*
51:48 *Determining comfort for vision at different distances requires recalibrating image chains and considering desired lens comfort.*
55:06 *The addition of corrective lenses affects near vision more significantly than distance vision.*
58:29 *Overlapping comfortable vision zones hint at potential for bifocal lenses; gaps necessitate progressive lenses.*
59:10 *Presbyopia compensation methods with contact lenses include monovision (one eye for near, one for far vision) and bifocal techniques.*
Made with HARPA AI
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Nous organisons des journées portes ouvertes tous les lundis après-midi dans notre centre de paris 17e pour les étudiants qui veulent échanger avec nos étudiants ou professeurs