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2. Four prism dioptre reflex test - Wikipedia

   en.wikipedia.org/wiki/Four_prism_dioptre_reflex_test

   The Four Prism Dioptre Reflex Test (also known as the 4 PRT, or 4 Prism Dioptre Base-out Test) is an objective, non-dissociative test used to prove the alignment of both eyes (i.e. the presence of binocular single vision) by assessing motor fusion. [1]

3. Maddox rod - Wikipedia

   en.wikipedia.org/wiki/Maddox_rod

   The Maddox rod test is a subjective method to measure horizontal and vertical deviations of the eyes, using a red line and a white light. The double Maddox rod test can also assess torsion and cyclotropias, by comparing the angles of two red lines.

4. Hirschberg test - Wikipedia

   en.wikipedia.org/wiki/Hirschberg_test

   The Hirschberg test, also known as the Hirschberg corneal reflex test, is a method to assess ocular misalignment by observing the light reflex on the cornea. It can detect exotropia, esotropia, hypertropia or hypotropia and is used in optometry and ophthalmology.

5. Dissociated vertical deviation - Wikipedia

   en.wikipedia.org/wiki/Dissociated_vertical_deviation

   Dissociated vertical deviation (DVD) is an eye condition that causes one eye to drift upward spontaneously or after being covered. It is often associated with squints and can be diagnosed and treated by ophthalmologists.

6. Suppression (eye) - Wikipedia

   en.wikipedia.org/wiki/Suppression_(eye)

   During an eye examination, the presence of suppression and the size and location of the suppression scotoma may be the Worth 4 dot test (a subjective test that is considered to be the most precise suppression test), or with other subjective tests such as the Bagolini striated lens test, or with objective tests such as the 4 prism base out test.

7. Prism correction - Wikipedia

   en.wikipedia.org/wiki/Prism_correction

   Prentice's rule is a formula to calculate the amount of prism correction in a lens based on decentration and lens power. It can be used for prescribing, tolerance control, or determining unprescribed prism in eyeglasses.

8. Prism cover test - Wikipedia

   en.wikipedia.org/wiki/Prism_Cover_Test

   The prism cover test (PCT) is an objective method to measure ocular misalignment or deviation of the eye. It involves using prism bars, occluder, and targets to neutralise the deviation and record the angle and base of the prism.

9. Cover test - Wikipedia

   en.wikipedia.org/wiki/Cover_test

   A cover test or cover-uncover test is an eye examination to measure ocular deviation. Learn about the alternating and unilateral cover tests, the fixation targets, the characteristics of strabismus and the practical application of the test.