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  1. S. M. Newhall, The Control of Eyelid Movements in Visual Experiments, Am. J. Psych. 44, 562 (1932).
    [Crossref]
  2. The lid-holder was found to be unsuited to two individuals who were going to participate in the experiment. In case of one the lashes were very long, even close to the external canthus; and this individual was unable to open his eyes widely. For those reasons it was found impossible to get the bar below all the lashes; on the contrary, some of them would be invariably forced against the cornea. The eye of the other potential subject was too deep-set by about 1/4 in. to get the spoon in the correct position.
  3. H. E. Ives, A Visual Acuity Test Object, Elec. World 55, 939 (1910).
  4. The writer is indebted to Dr. K. W. Spence whose acuity set-up was made available for this study during an interval in infra-human primate experimentation.
  5. The formula is, W=w/2(sin 12θ), in which the acute angle, θ, which the two systems of rulings make with each other is read from the instrument scale, and the constant w is the width of the rulings, i.e., 1/480 in.

1932 (1)

S. M. Newhall, The Control of Eyelid Movements in Visual Experiments, Am. J. Psych. 44, 562 (1932).
[Crossref]

1910 (1)

H. E. Ives, A Visual Acuity Test Object, Elec. World 55, 939 (1910).

Ives, H. E.

H. E. Ives, A Visual Acuity Test Object, Elec. World 55, 939 (1910).

Newhall, S. M.

S. M. Newhall, The Control of Eyelid Movements in Visual Experiments, Am. J. Psych. 44, 562 (1932).
[Crossref]

Am. J. Psych. (1)

S. M. Newhall, The Control of Eyelid Movements in Visual Experiments, Am. J. Psych. 44, 562 (1932).
[Crossref]

Elec. World (1)

H. E. Ives, A Visual Acuity Test Object, Elec. World 55, 939 (1910).

Other (3)

The writer is indebted to Dr. K. W. Spence whose acuity set-up was made available for this study during an interval in infra-human primate experimentation.

The formula is, W=w/2(sin 12θ), in which the acute angle, θ, which the two systems of rulings make with each other is read from the instrument scale, and the constant w is the width of the rulings, i.e., 1/480 in.

The lid-holder was found to be unsuited to two individuals who were going to participate in the experiment. In case of one the lashes were very long, even close to the external canthus; and this individual was unable to open his eyes widely. For those reasons it was found impossible to get the bar below all the lashes; on the contrary, some of them would be invariably forced against the cornea. The eye of the other potential subject was too deep-set by about 1/4 in. to get the spoon in the correct position.

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Figures (4)

Fig. 1
Fig. 1

Lid-restraining bar in position.

Fig. 2
Fig. 2

Resolution thresholds with and without artificial lid-restraint.

Fig. 3
Fig. 3

Resolution threshold with restraint relative to normal threshold, during a period of 10 minutes.

Fig. 4
Fig. 4

Resolution threshold with restraint relative to normal threshold, during a period of 20 minutes.

Tables (1)

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Table I