The right amount of Retinal Defocus Training and other questions
FAQ n. 33. Power Vision System - I’m going to put some questions to you about carrying out the techniques, so as to be able to start practicing.
a. Concerning the exercise of stretching “rotations fixing at a point,”am I supposed to turn my head on a horizontal level, fixing at a point (as if I were shaking my head, No), or should I carry out an imaginary circle with my head, fixing at a point?
b. Which exercise is the most important, “rotations fixing at a point” or “cyclorotations”?
c. In the Basic Level Program, are you talking about rotations with open eyes (stretching variant for rotations fixing at a point) fixing at a point at over 10 feet of distance, or about those that are described as a “stretching variant for cyclorotations,” as if we wanted to follow the borders of a very big clock? If the latter is the right one, how could I fix at a point if I’m carrying out rotations with my eyes?
d. As for stretching in the static position, but not the circular one:For how long am I supposed to keep a certain position? Maybe I shouldn’t stay still in one position but alternate with certain rhythm and speed?
e. As for taking breaks while working on reading with positive training lenses: For how long am I supposed to read before having a break? For how long should each break last? Am I supposed to take off the training glasses during these breaks?
f. Is the size of the letters in the text very important when we train to read with training lenses? Which size is the best one?
g. Is it true that some people are able to reach visual acuity over 20/20 with the methods of visual reeducation?
h. As for different acuity between two eyes: Which difference (in diopters, if possible) requires training with reading with suitable lenses on, blindfolding the weak eye at first, so as to make it equal to the good one? When isn’t such a difference important?
i. If I understood well, in training with training lenses, the true reading of the text starts after focusing it perfectly with CRB movements, and only at that point should we read it, as long as it’s perfectly clear; when the text starts becoming blurred again I must repeat CRB movements and then start reading it again. Or, if after CRB movements the text is still slightly blurred am I supposed to read it?
j. Here’s a paper with the image of three lines of the text that I gradually made blurred. Can you tell me which one among these lines is to be considered an initial level of fogging of the text to be followed with CRB movements?
- Answers David De Angelis
Here are my answers:
a. The exercise of ocular stretching “rotations fixing at a point” must be carried out so as to let all the extraocular muscles be subjected to the same level of stretching out. If you carried out this exercise only on a horizontal level (as if you were shaking your head, No), you would work only on symmetry and coordination of your “right and left” musculus rectus, butnot the “superior and inferior” ones, as would happen even nodding Yes with your head. “Diagonal” positions must betaken into account.
b. The importance is to be attributed to the level of efficiency. The exercise of “rotations fixing at a point” is more efficient than simple rotations because we directly act over symmetry and coordination between both eyes. Probably, it’s very hard to keep “fusion” between the eyes in some extreme parts of the visual field: such a condition shows an imbalance between strength and flexibility of the two eyes. The consequence of such imbalance is a low binocular fixation on one side, and on the other, the lower level of “central fixation” or “centralization.” Any shifting from the central fovea leads to a lower quality image. This is the reason why ocular stretching is particularly beneficial for restoring your visual acuity.
c. You can fix at a point, carrying out the rotations with your eyes and keep on fixing at a point at the same time.
d. In the positions of stretching, the time of keeping each single static position itself determines the level of intensity of the exercise: the more you maintain one position, the more intense the exercise will be and, consequently, the level of muscular contraction (agonist) as well as the level of stretching out and lengthening the muscle that is antagonist to the movement. The duration of fixing is approximate and it must be adapted to the initial strength and flexibility of the ocular muscles. The duration must be adapted and lengthened little by little, until the muscle gets used to the load, or the intensity (the relationship of ocular range/duration of contraction). Like in the exercise of retinal defocus, if you don’t increase the training stimulus gradually, the adaptation and consequently the improvement in visual acuity would stop.
e. The duration of the breaks is approximate and must be adapted to each person, so trust your feelings. As soon as you feel ready, go on doing the exercises of retinal defocus. I advise you to take the training glasses off during the breaks.
f. There’s no perfect size: the basic factor is to create slight fogging, to make the text become slightly blurred, trying to focus the letters.
g. What is usually called “emmetropia” is a simple convention:such convention is still at 20/20 visual acuity, according to the Snellen table. Monkeys, and generally all wild animals, have more or less clear levels of “hyperopia,” as it would be defined concerning this “convention.” We could develop the visual acuity over 20/20 with PVS. If man had stayed wild, without being constantly exposed to the state of overaccommodation due to narrow places (indoors), probably 21/20 or even more would have been considered as normal visual acuity. The way to run so as to overcome 20/20 is the same one that the myope must run to recover from his refractive error. The exercises are the same: muscular training and retinal defocus. The only difference is that a myope works with low positive lenses (for example, +1), but the person who wants to overcome 20/20 must ensure a suitable state of retinal defocus with +8 diopters. It’s important to increase visual-acuity viewing in distance and maintain it in viewing near; otherwise we run the risk ofdeveloping hyperopia (farsightedness with little adjustment at near distance). It’s up to every single person to see when is the right moment to finish working with defocus.
h. We shouldn’t care a lot when the difference in adjusting/focusing between two eyes (anisometry) is 0.25. If it is higher, at first, we should work on the weaker eye (which suffers from
a greater visual defect) to take it to the same level as the other one. You can work on both of your eyes at the same time.
i. You have understood everything completely well: the work you carry out must be with slight fogging (moving the text away or bringing it nearer; it depends whether it’s a matter of myopia or hyperopia), the CRB movements, focusing. Then repeat thesequence.
j. The higher the level of fogging with which you are able to focus well, the higher the level of adaptation and consequently the improvement for your eyes. For fogging as in number 3 in your image, adjust with CRB movements until the image is more in focus, like number 1. Then, repeat the sequence, if possible, moving the text away.
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